Question

The Allies agreed on a “Europe First” strategy because only Germany had the ability to bomb Britain, fight U.S. and British navies, and
A) launch submarines capable of sinking Allied ships.
B) seriously threaten to defeat the Soviet Union.
C) send waves of bombers to attack its enemies.
D) convince Japan to surrender.

Answer 1

The allies agreed on a "Europe First" strategy because only Germany had the ability to bomb Britain, fight U.S and British Navies, and   B. Seriously threaten to defeat the soviet Union
The Allied than concluded that Germany is a serious long term Threat and should be taken care of as soon as possible

hope this helps

Answer 2

B) seriously threaten to defeat the Soviet Union.