P: E → FP: ?C: E → G

sharpen7 July 14, 2017

Question

How did you know it was not G to not F?

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Mehran July 15, 2017

@sharpen7 the missing premise here is F ==> G.

That allows for the following transitive chain:

E ==> F ==> G
not G ==> not F ==> not E

(A) is the contrapositive of F ==> G, i.e. not G ==> not F, which is identical in meaning so (A) is the correct answer.

Hope that helps! Please let us know if you have any other questions.