It helped them find and attack German planes.
Hope this helps love!!
B. Because even with many issues that plagued the Roman Empire economically and politically, By the later years of the empire the Roman military was mainly comprised of trained Barbarian soliders who were inferior to earlier Roman soliders causing a significant decrease in the Roman Empires's Military capablities so many barbarian tribes that began to grow such as the Huns, Vandals, Goth etc. Put immense pressure on the Empire, driving them into the ground economically and causing many issues within the government and eventually being sacked, thus marking the end of the Roman Empire. Sorry for the wall of text but hope this helped :)
As it was the Cold War which meant that neither side was willing to attack the other as both sides had atomic weapons aimed at the other. This would lead to a nuclear war
B is the correct answer.
To become the Chair of a committee in Congress, you really just need to stay on the Committee for the longest and have your party win control of the House.