Which of the following sentences includes a transition that would work well in a comparison​ essay?

A.
Fish are dying because oxygen levels in the lake are too low.

B.
Democrats place a great emphasis on​ freedom; as​ well, Republicans highly value individual freedom.

C.
An insect​'s body is composed of a​ head, a​ thorax, and an abdomen.

D.
Personal computers generally have their memories measured in megabytes.