Answer:
Correct answer is D. British influence on rock 'n' roll music in the United States.
Step-by-step explanation:
A is not correct as Britain never had such an important tole when it comes to policy of United States.
B is not correct as WW2 lasted from 1939 until 1945.
C is not correct because Britain lost all of its possession after WW2 in that area.
D is correct as it was a period when British rock bands made large impact in United States. It started with Beatles, and later with Rolling Stones and many others.