If Moral Theories Measure Outcomes or Consequences, Then They Do

Multiple Choice

If moral theories measure outcomes or consequences, then they do not concern duty. If trolley cases are compelling, then moral theories measure consequences. Moral theories concern duty. So, trolley cases are not compelling.
-Working backward from the conclusion of this argument, which of the following is the most likely justification of the last step of the derivation?

A) Com
B) DS
C) MT
D) MP
E) CD