I'll explain it in my own words..
The main theme of the poem is what the poem is mostly about. It teaches you about the moral and the life lesson you can learn from the poem.
Any coastal area has the potential to be struck by a tsunami but out of the options you provided Alaska is definitely at most risk.
This is because Alaska is facing what scientists call a megathrust (subduction zones) in which almost three quarters of all tsunamis tend to occur.
Fun Fact: The largest tsunami ever recorded was in Alaska with waves reaching a whopping 1720 feet high (524 meters)!
Answer:
The answer is C, for sure.
Explanation: