What Will Be Your Prediction as to How RQ Changes

What will be your prediction as to how RQ changes during the later phase of prolonged exercise when bodily carbohydrate is running out?

A) RQ will increase because there is an increase in fat utilization
B) RQ will decrease because there is an increase in carbohydrate utilization
C) RQ will increase because there is an increase in carbohydrate utilization
D) RQ will decrease because there is an increase in fat utilization