What is the topic sentence in the paragraph?

A group of fish is called a school. A flock is a group of birds. A group of coyotes is a pack. The name for a group of lions is a pride. Different groups of animals have special names.

A.
The name for a group of lions is a pride.

B.
Different groups of animals have special names.

C.
A group of coyotes is a pack.

D.
A group of fish is called a school.

B. Different groups of animals have special names.

B.

Different groups of animals have special names.