I Know Something If, and Only If, I Have Some $\lor$

I know something if, and only if, I have some causal contact with the physical world. If I know something, then there is no demon deceiver. I know something. So, I know something just in case both I have causal contact with the physical world and there is no demon deceiver.
-Which of the following propositions is an immediate (one-step) consequence in PL of the given premises?

A) (K ⊃ C) • (C ⊃ K)
B) K $\lor$ D
C) K $\lor$ ∼D
D) All of the above
E) None of the above

Correct Answer:

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