00:00

Question 120·200 Super-Hard SAT Reading Questions·Craft and Structure

For years, critics described the smoky halos on Nia Calder’s stoneware vessels as deliberate citations of open-pit pottery. Calder’s studio ledgers record clay batches and electric-kiln temperatures in unusual detail, but they contain no mention of smoke firing or pit-fired models. The silence of those meticulous records is therefore evidence of a peculiar kind: more useful for unsettling the established account than for replacing it. Conservators subsequently found that manganese-rich particles in Calder’s early clay could migrate toward vessel surfaces during electric firing, creating halos without special intervention. Yet after Calder changed to purified commercial clay, she reproduced the halos with a manganese wash. The evidence thus suggests that a feature originating as a material effect became an intentionally retained motif.

Which choice best describes the function of the underlined sentence in the text as a whole?