Which sentence from the selection best expresses the central idea?
A Crocodiles are the only reptiles that show parental care.
B Kenichi (Ken) Okamoto, a student at the University of Chicago, read about the problem and decided to try to find out more about what was happening.
C Natives hoping to earn a living started crocodile farms, where the reptiles are raised and slaughtered for their skins.
D Trapping is one way that is often safer for both people and smaller crocodiles.
Identifying the Main Idea in a Selection
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The best sentence that expresses the central idea is: A Crocodiles are the only reptiles that show parental care.
Explanation: This sentence summarizes a key feature of crocodiles that distinguishes them from other reptiles and highlights an important aspect of their behavior. The other options focus on specific actions or events rather than the overarching concept of crocodiles exhibiting parental care, which is likely the main point of the selection.