Which item below would be the best question for paige to ask on her survey ?

a, b,c or d

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I would say A is the answer.
A talks about the money spent which directly asks the question she needs to support her thesis. B isn't relevant so it's not the answer. C is related, but it's asking about something too general instead of breakfast in the morning. And D may seem like it's related to her thesis, but it's not relating it to energy gained from eating breakfast. So A is the most probable answer.