Which would be an appropriate follow-up question to ask this student? “do you have a favorite recipe for fresh fruit smoothies? ”“what are the health problems caused by sugary drinks? ”“don’t you think smoothies are a lot more expensive? ”“how do you know so much about nutrition? ”

The appropriate follow-up question to ask this student, according to the text you added in the comment box, would be the second one: "What are the health problems caused by sugary drinks?"

Explanation:

The other questions would also be accurate if the conversation continues, but, as a follow-up question to this student's comment, the second one would be the one because it is directly related to his statement and digs deeper into the subject he is talking about.

id say it means hes fearful and/or cautious

have a good day

yeah! it's really me with my homework, you should try it!