Final answer:
The second premise that could be used as an invalid argument affirming the consequent is B. 'You didn't attend today's class meeting.'
Step-by-step explanation:
The second premise that could be used as an invalid argument affirming the consequent is B. 'You didn't attend today's class meeting.' The form of reasoning in this argument is Affirming the Consequent, which is an invalid inference. Affirming the Consequent follows the structure:
- If X, then Y.
- Y.
- Therefore, X.