Answer:
his argument takes the form of modus tollens, which is a valid argument form in propositional logic. The argument form can be represented as:
1. If A then B
2. Not B
3. Therefore, not A
The given argument matches the form of modus tollens, where the first premise (1) is logically equivalent to its contrapositive: If B is false, then A is false. The second premise (2) is the negation of the consequent, B. The conclusion (3) is the negation of the antecedent, A.