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.
include the animal known as the killer whale, which can grow to be 30 feet long and is
include the animal known as the killer whale, growing as big as 30 feet long and growing.. modifies the preceding sentence rather than 'whale' because of a comm
include the animal known as the killer whale, growing up to 30 feet long and being growing.. and being is parallel, but any reason to use progressive form? --> out
include the animal known as the killer whale, which can grow as big as 30 feet long and is
include the animal known as the killer whale, which can grow to be 30 feet long and it is to be is very suspicious, another error is 'and it is'. since 'and' is not spliced by a comma, we don't need to repeat the subject, it. ---> out
my pick is D.
parallel : can grow.... and is....