There are theories on what caused the u. s.s. maine to explode while it sat in the havana harbor. what are they?

spanish spies set fire to the gunpowder.
cannons from shore batteries hit the ship.
the battleship struck a mine.
coal spontaneously combusted.

The best and most correct answer among the choices provided by the question is the third choice or letter C.

One theory on what caused the U.S.S. Maine to explode while it sat in the Havana Harbor was that it struck a mine.

I hope my answer has come to your help. God bless and have a nice day ahead!

4. great depression