Which statement about the pacific theater in world war ii is true?

a.
navajo indians in the u. s. marine corps developed an unbreakable code using their native language.

b.
guadalcanal was chosen by american planners for invasion because of its pleasant climate and open terrain.

c.
at the battle of midway, japanese planes sank four american aircraft carriers.

d.
after the battle of the coral sea, japanese forces invaded and captured australia.