金刚鹦鹉为什么要叫金刚?

A. It is a type of parrot that is known for being aggressive. B. It is a type of parrot that is known for being intelligent. C. It is a type of parrot that is known for being mischievous. D. It is a type of parrot that is known for being a fighter.

The correct answer is C. It is a type of parrot that is known for being mischievous.

The word "金刚" means "mischievous" or "playful". This is the meaning of the word in the sentence, so it is the correct answer.