Which of the following statements is true about the Harvard Step Test?

A. It mainly uses gymnasium bleachers as the test equipment.
B. Its objective is to measure cardiorespiratory fitness with a submaximal step test for senior females.
C. Its objective is to estimate the capacity of the body to adjust to and recover from hard muscular work.
D. It can be safely used for adult males who are 60 years and above.

Answer: C