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.

1. include the animal known as the killer whale, which can grow to be 30 feet long and is
2. include the animal known as the killer whale, growing as big as 30 feet long and
3. include the animal known as the killer whale, growing up to 30 feet long and being
4. include the animal known as the killer whale, which can grow as big as 30 feet long and is
5. include the animal known as the killer whale, which can grow to be 30 feet long and it is

the answer is A?? why

个人意见
B，首先growing as big as 30 feet long and is famous for its

aggressive hunting pods这个一看就是不平行。排除        
C，grow up to 这里up应该不需要吧~~~
D，as big as，wordy
E， which can grow to be 30 feet long and it is这里也是不平行，因

为which这里是个修饰部分，但是it is 却是一个句子。