21.3.24 (Must be True Questions Problem Set 8)

Accounts Playable

I thought I diagrammed this correctly, but I can't figure out how E is "properly concluded" or must be true.

Here is my diagram:

Explanation--->Must Distinguish from justification
Human action--->potentially has an explanation-->Can give an accurate description of the causes of the action (I don't think you can link these up to the first sentence)

Action justified--->person performing has sufficient reason to act
Action justified SOME justification forms no part of the explanation (These you can link together).

Generally, rational--->justification/reasons form an essential part of the explanation

What I was looking for: Since the only thing I could link up were those two middle statements, I thought the answer was going to be Person performing has sufficient reason to act SOME justification forms no part of the explanation. This isn't an answer choice though.

Answer A: This isn't in any of my chains.

Answer B: This isn't in any of my chains.

Answer C: I ended up picking this one even though I didn't see any support/I had eliminated all of the other answer choices. It was the "closest" to what what I was looking for, but it still wasn't in any of my chains. Explanation isn't part of the linked up middle statements.

Answer Discovered? Totally irrelevant idea.

Answer E: This is the answer choice, but where is the support? The only time "cause" is mentioned is in the second conditional statement. But even then, it is only talking about giving a "description of the cause." Rationality does imply reasons forming an essential part of the explanation (last conditional statement), but why must they be causes? Shouldn't this answer choice be "If any human actions are rational, then the reasons must be given an accurate description of the causes of the action?" I don't see how this is the same thing as what answer choice E states.