How can you tell if an argument is valid? a. valid arguments are always sound. b. the premises lead logically to the conclusion. c. valid arguments are never sound. d. there are two premises and a conclusion.

An argument is valid when B. the premises lead logically to the conclusion.

Valid arguments can be either sound or not sound, so answer A and C are incorrect. There is no specific number of premises an argument should have, so answer D is incorrect.
Valid arguments have valid explanations, so if the premises are true and logically guarantee the conclusion is true, then the argument is valid.