Which of the following is thought to be the common ancestor to plants?

A. Chemoautotrophs

B. Chordata

C. Cnidaria

B. Chlorophytes

Option D, Chlorophytes

These are taxons of green algae and consists of both chlorophyll A and B. Chlorophtyas usually live in fresh water. These are able to produce their own food and thus form a mutual relationship with lichens to provide food to lichen and in response to which lichen provide raw material to chlorophytes for food production.