Which of the Following Is Not One of the Hypotheses

Multiple Choice

 Which of the following is not one of the hypotheses scientists accept as a reason why humans maintain a body temperature around 37°C?

A) Being warm allows humans to be ready for movement at all times.
B) Being too much warmer would cause human proteins to break down.
C) The warm temperature allows our muscles to work more with less fatigue.
D) A lower temperature would cause the immune system to go out of control.