The question is asking you to find this if it is worded like this: "What is the best summary of the selection?"
What is a summary?
The question is asking you to find this, if it is worded like this: "The details in paragraph 5 support the idea that - "
What are supporting details?
The question is asking you to find this, if it is worded like this: " Which idea does the author emphasize throughout the selection?"
What is main idea?
The question is asking you to find this, if it is worded like this: "Thw most likely reason the author includes this - "
What is author's purpose?
The question is asking you to find this, if it is worded like this: "In paragraph 5, Anthony chooses not to mention the ready-made pesto most likely because he - "
What is character motivation/traits?