I think the answer is A, it's the one that makes the most sense
The United States was able to pay for the construction of the Panama Canal by negotiating and financing land treaties with the governments of Panama and Columbia. The treaty came to be known as Mallarino- Bidlack treaty. This was a very important treaty for the Americans as they got the control of the Panama Canal.
Mercenaries were groups of people that pretty much had no loyalty to a single nation. The fought along with nations that paid them (roman empire in this case).
Generally speaking, in the United States, no it is false that Pastoralists have adapted their culture to their environment, since it is more the case that their environment shapes their culture. <span />
