Question 69·Hard·Inferences
Conservators studied two bronze figurines recovered from a first-century CE layer at Portus, the harbor of ancient Rome. Lead isotope ratios in the bronze match ores from southern Iberia rather than Italian deposits. Yet grains of casting sand trapped inside hollow cavities contain foraminifera species restricted to the Tiber delta, and the tool marks on the bases correspond to techniques documented in workshops around Rome of that period. From this, the conservators concluded that _____
Which choice most logically completes the text?
For SAT "Most logically completes the text" questions based on evidence, first mark the key facts and what each one tells you (e.g., origin of material vs. location of manufacture). Then look for the answer that combines all the given clues without contradicting any detail and without adding new, unsupported ideas. Quickly eliminate options that clash with a specific phrase from the passage or that introduce extra assumptions (like motives, migrations, or technology) that were never mentioned.
Hints
Separate origin of materials from place of manufacture
Ask yourself: which detail tells you where the bronze itself came from, and which details tell you where the casting and finishing work were actually done?
Use each scientific clue carefully
Look closely at the phrases "match ores from southern Iberia rather than Italian deposits," "foraminifera species restricted to the Tiber delta," and "techniques documented in workshops around Rome." What location does each of these point to?
Watch for contradictions or extra assumptions
Eliminate any option that contradicts one of the specific clues (about ore source, sand source, or workshop techniques) or that brings in new ideas (like people moving) that the passage never mentions.
Step-by-step Explanation
Interpret the lead isotope evidence
Focus first on the sentence: "Lead isotope ratios in the bronze match ores from southern Iberia rather than Italian deposits." This tells you where the metal itself (the bronze) originally came from. It clearly points to southern Iberia as the source of the bronze, and it rules out Italian ore sources.
Interpret the casting sand evidence
Next, look at: "grains of casting sand trapped inside hollow cavities contain foraminifera species restricted to the Tiber delta." Foraminifera live in specific locations, so if the species are restricted to the Tiber delta, that means the sand used for casting comes from that area near Rome, not from southern Iberia.
Interpret the tool mark evidence
Then consider: "the tool marks on the bases correspond to techniques documented in workshops around Rome of that period." This links the way the figurines were worked on to known Roman workshops. So the style of workmanship matches workshops near Rome, not workshops in Iberia.
Combine the clues and match to the answer choices
Putting it all together: the metal originates in southern Iberia, but the sand and workshop techniques are specific to the Tiber delta area around Rome. That means the bronze must have been brought from southern Iberia and then cast and finished into figurines in workshops near Rome. The choice that states this combined conclusion is "bronze from southern Iberia was imported and cast into the figurines in workshops near Rome."