The answer would be A, C, B. The most general is asking how mountains form. It is slightly more specific to ask about how underwater mountains are formed. The most specific is asking about a specific mountain in Hawaii.
The Most general question would have to be A. How do mountains form
Then the next would be C. How do underwater mountains form, because you are talking about a specific mountain type.
Finally your narrowest question would have to be B. How did Hawaii's underwater mountain of Mauna Kea form, this is because you are asking a bout a specific underwater mountain.
