During Heavy Exercise, Which of the Following Are Common Respiratory $\dot V$

Multiple Choice

During heavy exercise, which of the following are common respiratory effects?
I. $\dot V$ _E may grow as high as 150 L/min.
II.The respiratory rate approximately triples.
III.The tidal volume increases approximately sixfold.
IV.The tidal volume does not change.

A) I, II
B) III, IV
C) II, III, IV
D) I, II, III