When it first entered world war ii, why did the united states agree to commit most of its resources to the war in europe?

a) stalin assured roosevelt that the soviet union could deal with japan

b) roosevelt felt that the other 30% was needed to defend the us mainland

c) roosevelt did not feel the united states needed to engage japan

d) roosevelt felt that germany was more of a threat than japan

D) Roosevelt felt that Germany was more of a threat than Japan

Explanation:

The Allied forces focused on Europe first, and apportioned with the threat in the Pacific later. The main reason was that two allied capitals (London and Moscow) could be straight threatened by Germany, while Japan could not directly portend any capitals.  

The United Kingdom was the most susceptible to attacks from Germany, as they had already taken most countries in Western Europe. It was also thought that if Germany was beaten, Italy and Japan would be debilitated and might give up. Even with the attack on Pearl Harbor, the United States wedged to the "Europe First" policy.

what are the choices?