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Passage: The Indus Valley Civilization, which flourished over 4,000 years ago, is known for its remarkably organized cities such as Mohenjo-daro and Harappa. These settlements featured advanced drainage systems, standardized brick sizes, and grid-patterned streets, suggesting strong centralized planning. Yet despite decades of excavation, scholars still debate why this civilization declined, with theories ranging from climate change to shifting river courses. Question: What is the author’s purpose in mentioning that scholars ‘still debate’ the decline?
A. To argue that climate change is the only cause
B. To show that the civilization's decline remains an open scientific question ✅
C. To criticize modern historians for laziness
D. To prove the civilization never actually declined
