Question

after attacking the us at pearl harbor, japan decided to
retreat to its homeland.
stop to regroup at its homeland.
continue to expand in the pacific.
join the axis powers.

Explanation:

After the Pearl Harbor attack, Japan aimed to expand its control in the Pacific. It didn't retreat or stop to regroup (as it was on an offensive), and Japan was already part of the Axis powers before Pearl Harbor. So the correct choice is the one about continuing expansion.

Answer:

C. continue to expand in the Pacific.