'If it rains, the streets are wet. The streets are not wet. Therefore, it did not rain.' This is
AAffirming the consequent (invalid)
BDenying the antecedent (invalid)
CModus ponens (valid)
DModus tollens (valid: P → Q, ¬Q ∴ ¬P)
Answer & Solution
Correct answer: D. Modus tollens (valid: P → Q, ¬Q ∴ ¬P)
Classic modus tollens: from P → Q and ¬Q, validly infer ¬P. The argument denies the consequent, which is a valid form.
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