The end of an action is the intended outcome of the action and not a mere by-product of the action, and the end’s value is thus the only reason for the action.
Conclusion
Nothing will justify a means except an end's value.
Intermediate Conclusion
The end's value is the only reason for an action.
Premise
The end of an action is the intended outcome, not some accidental by-product, of the action.
Evaluate
The easiest way for me to find the conclusion (I don't know that I really understand this argument well, but I can still locate its parts), is to rely on the keywords sprinkled throughout.
The first sentence goes, Claim 1, and thus Claim2.
So we know that Claim 1 supports Claim 2. Claim 1 → Claim 2
The fact that the next sentence begins with So tells us that the first sentence supports the next claim. So we know that
Claim 1 → Claim 2 → Claim 3
Claim 3 takes a while to get to its main clause, beacuse the author is hemming and hawing with qualifiers.
So, while it is true that Concession A and even, perhaps, Concession B, it is clear that Main Conclusion.
Goal
We just want to pick an answer that gives a meaning match for the final claim: Nothing will justify a means except an end's value.