Which of the following gives sexual reproduction an advantage over asexual reproduction?
a. sexual reproduction often requires two parents to be present.
b. sexual reproduction increases genetic diversity.
c. sexual reproduction produces genetically identical offspring.
d. sexual reproduction happens more quickly than asexual reproduction

In letter A, obviously sexual reproduction requires to parent to produce an offspring.
in letter C, it's asexual instead of sexual reproduction. in asexual reproduction the offspring is identical to its parent.

in letter D, it is also asexual instead of sexual reproduction.

so the best answer is letter B, it genetically produce identical offspring.