To determine how the author supports the main idea in the section "Changing One Internal Clock," let's break down the options provided:
A. By explaining questions that researchers have - This option suggests that the author provides insight into what researchers are exploring or questioning.
B. By showing the importance of doing more research by researchers - This indicates that the author emphasizes the need for further investigation in the topic.
C. By discussing different conclusions reached by researchers - This suggests that the author highlights varying outcomes or interpretations from different studies or researchers.
D. By describing a research experiment - This implies that the author includes specific details about a particular experiment that demonstrates the section's main idea.
To select the best answer, you should consider which option aligns most closely with the key points presented in that section. If the section focuses on specific findings from experiments and provides in-depth details about how those experiments were conducted, then D would likely be the strongest choice. If the section instead discusses various conclusions from multiple studies, then C may be correct.
Ultimately, you'll need to refer to the actual content of the section to choose which option most accurately represents how the author supports the main idea. If you can provide more context or content from the section, I can help you further refine the answer.