Question: In the proof shown above, what is the correct justification for the third step? Theorem: Given p - q, - - 7q, -r, prove -p

In the proof shown above, what is the correct justification for the third step?

Theorem: Given p - q, - - 7q, -r, prove -p A 7q Proof: 1. p - q Premise 2. 7 - 79 Premise 3. q -r From Line 2 4. p - r From Lines 1 and 3 5. 75 Premise 6. -p From Lines 4 and 5 7. -9 From Lines 2 and 5 8. -p A -q From Lines 6 and 7 In the proof shown above, what is the correct justification for the third step? O Hypothetical syllogism Modus tollens Contraposition Modus ponens

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