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Question 72·Hard·Transitions

Researchers excavating the ancient city of Tikal recently used ground-penetrating radar to map structures hidden beneath dense jungle foliage. The scans revealed an extensive network of causeways and reservoirs, suggesting a highly organized urban layout. ______ the team cautions that radar imagery alone cannot determine the precise age or function of these constructions, so on-site excavations remain essential.

Which choice completes the text with the most logical transition?