I think it is B.) Caravan
Answer:
U.S. policy toward the region of the Persian Gulf has changed more and more often over the years more than any other foreign policy I can think of. Current U.S. policy can be traced back more than half a century. This said, the most useful place to begin to understand how we arrived where we are today is to return to the late 1960s, when Great Britain decided it could no longer sustain its commitments east of Suez.
Explanation:
Changes
You could say that it is laws regarding slavery. One of his basic laws way back in 1066 was that no man shall sell another men, or they would pay a fine. This basically outlawed slavery in Britain. However, they enslaved Africans because they didn't consider Africans to be men later when exploration of Africa began.
I dont know what your question is really saying
