Question

question 6 of 10 which of the following is a rhetorical question? a. what are some promising techniques for making solar cells more efficient? b. is wind or solar power the most cost effective alternative to fossil fuels? c. what qualifies a source of energy as renewable or nonrenewable? d. which do you think will run out first? coal and oil or wind and sunlight?

Explanation:

A rhetorical question is one asked for effect rather than to get an answer. None of these options are rhetorical as they all seek actual information about energy - related topics. But if we assume the question setter's intention, we note that rhetorical questions often don't expect a literal response. However, all these seem to expect answers.

Answer:

None of the above options are clearly rhetorical questions.