Whew....tough question.
I'll go with D
My line of reasoning is , the company's policy is to provide international exposure to the employees by sending them abroad for management education. The first bold-faced portion is introducing a policy that the arguments wishes to evaluate.....Correct - The argument does wish to evaluate this policy.This is evident from the conclusion in the last line of the stem
The second-bold faced portion, by saying that there are alternative ways to achieve the policy, is saying that policy is not needed
The only reason, I think, your answer seems to be incorrect is - the second bold faced portion is not saying that the policy is not achieving its objective. By sending the candidates abroad, the objective of providing international exposure is obviously achieved.
Cheers,
Unplugged