When Using the RQ to Estimate Fuel Usage During Exercise,the

Multiple Choice

When using the RQ to estimate fuel usage during exercise,the role that protein plays as a fuel source is often ignored.Why?

A) because protein generally plays a relatively small role as a fuel source during exercise
B) because protein cannot be used a fuel in skeletal muscle
C) because protein is only used as a fuel in muscle during short duration exercise lasting less than 20 seconds.
D) none of the above answers are correct.