Conform to Principle vs. PSA

dazedandconfused-1

Hi guys,

I have a question on the difference between question stem types that ask for "which of the following most closely conforms to one of the principles" vs. "which of the following, if valid, most justifies the argument?"

I'm specifically looking at PT 58.1.23, which is a conform to principle type question. The right answer is C), which is "social concerns should sometimes take precedence over economic efficiency."

Now, I know that in a PSA type question, the "sometimes" in the answer choice would make the answer choice way too weak to be make the argument valid. But is it acceptable to have a "weaker" answer choice for Conform to Principle type questions?