Answer:
a. They were considered unwelcome
Explanation:
Im sorry there is not enough info, can u add some?
"<span>A. attacking US troops and then hiding in the jungle" is the best option from the list, since it was this tactic that most thwarted many US troops--mainly because they were far less familiar with the terrain.</span>
The only example of a historical argument would be "<span>B.The Roman Empire traded with Han China because Chinese silk had been found in early Roman cities," since this would require some evidence in order to be convincing. The other options are either questions on basic facts. </span>
