Question

1. the following question has two parts. first, answer part a. then, answer part b. part a which sentence summarizes a central idea in \a scratch tells all\? a the benefits of farming outweigh any possible negative effects. b science and history reveal that diet strongly affects tooth decay. c the creation of refined sugar created worldwide health problems. d tooth decay has decreased significantly since the pre - farming era.

Explanation:

To solve this, we analyze each option:

• Option A: The text “A Scratch Tells All” likely focuses on tooth decay and diet, not farming benefits outweighing negatives. Eliminate A.
• Option B: The title and context suggest a link between diet (from science/history) and tooth decay, which fits a central idea.
• Option C: The text may not center on refined sugar creating worldwide health problems (too narrow). Eliminate C.
• Option D: If the text is about how diet (like farming - related diet changes) affects tooth decay, tooth decay may not have decreased since pre - farming (maybe increased with dietary changes). Eliminate D.

Answer:

B. Science and history reveal that diet strongly affects tooth decay.