Each Group of Sentences Below Could Be Organized into and Written

Each group of sentences below could be organized into and written as a paragraph. In each group, select the letter of the topic sentence. Which sentence is the topic sentence?

A) The insect begins life as an egg.
B) The fully developed larva, or caterpillar, spins a cocoon and forms a pupa inside it.
C) There are four stages in the metamorphosis of certain insects.
D) Once hatched, the wormlike larva grows, shedding its skin several times.
E) At last the winged adult emerges, looking completely different from all its previous forms.