In an analysis of a longer informational text, Mackenzie writes that cats purr for various reasons. This is an excerpt.

(1) Kittens learn how to purr when they are a couple of days old. (2) Veterinarians suggest that this purring tells “Mom” that “I am okay” and that “I am here.” (3) It also indicates a bonding mechanism between kitten and mother. (4) As the kitten grows into adulthood, purring continues.

Which sentences contain textual evidence that supports her analysis?

A
sentences 1 and 2

B
sentences 2 and 3

C
sentences 2 and 4

D
sentences 3 and 4