(A ⊃ B) ⊃ (∼B ⊃ ∼A)

question 152

Multiple Choice

(A ⊃ B) ⊃ (∼B ⊃ ∼A)
Which of the following propositions is a proper assumption for conditional proof to prove that the above wff is a logical truth of PL?

• A) (A ⊃ B) ⊃ (∼B ⊃ ∼A)
• B) (A ⊃ B) ⊃ ∼B
• C) A ⊃ B
• D) A

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