Which One of the Following Illustrates an Overgeneralization Error? the Words

Which one of the following illustrates an overgeneralization error? The words in question are underlined.

A) Abe knows what the words tall and short mean, but he does not realize that one is the opposite of the other.
B) Charles thinks that all animals have to have fur and four legs; therefore snakes, bumblebees, and people cannot possibly be animals.
C) Bhanu says, "I forgetted my homework today."
D) Maria thinks that whales and dolphins are kinds of fish, when they are actually mammals instead.