One of the Evolutionary "Enigmas," or Unsolved Puzzles, of Sexual

One of the evolutionary "enigmas," or unsolved puzzles, of sexual reproduction is that

A) sexual reproduction allows for more rapid population growth than does asexual reproduction.
B) only half of the offspring from sexually reproducing females are also females.
C) asexual reproduction produces offspring of greater genetic variety.
D) sexual reproduction is completed more rapidly than asexual reproduction.
E) asexual reproduction is better suited to environments with extremely varying conditions.