Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. Males may save energy when competing for mates by using only whine-chuck calls rather than both whines and whine-chucks. B. Males expend as much of their energy on whine-chuck calls as on whine calls when competing with other males. C. Males save energy by using whine-chuck calls only when competing with other males. D. Males that save energy by using only whines are less able to compete with other males.