The 32 species that make up the dolphin family are closely related to whales and in fact include the animal known as the killer whale, which can grow to be 30 feet long and is famous for its aggressive hunting pods.
(A) include the animal known as the killer whale, which can grow to be 30 feet long and is
Correct. "Include" correctly refers to the plural subject "the 32 species". "which" correctly modifies the the whale and the construction gives the logical meaning.
(B) include the animal known as the killer whale, growing as big as 30 feet long and
"Include" correctly refers to the plural subject "the 32 species" but "growing" modifies the verb " include" , which distorts the meaning
(C) include the animal known as the killer whale, growing up to 30 feet long and being
Same reason as B
(D) includes the animal known as the killer whale, which can grow as big as 30 feet long and is
Subject Verb issue. The 32 species (Plural) have a singular verb "includes "
(E) includes the animal known as the killer whale, which can grow to be 30 feet long and it is
Same as D