Male Bullfrogs Produce Loud Calls During the Mating Season to Attract

Male bullfrogs produce loud calls during the mating season to attract females. The loudest males tend to mate with the most females. What can we reasonably conclude about this situation?

A) The loudness of a maleʹs call is not a good predictor of his quality.
B) We cannot come to any conclusions based on the information given.
C) The louder a maleʹs call, the lower his quality.
D) The louder a maleʹs call, the higher his quality.