What kind of factors most directly influenced the us to take control of the hawaiian islands

Answer :

In the beginning of the 1820's,the U.S became to have economic relationship with Hawaii and then friend relationship,these relationship became more and more stronger,but later Washington learned that european powers like France,Great britain, later spain (which see economic privileges they can get too )were trying to force this country to have some inequal economic relation with them and later to invade the island.

As they were many american citizens in the island and for defending his interests in the island and in the pacific,the  US decided to take control of the island

i would say b. or c.