Consider This Argument: "If We Bought the Movie Tickets Online

Multiple Choice

Consider this argument: "If we bought the movie tickets online or asked for the student discount, we saved a dollar per ticket. We did save a dollar per ticket. So we must have bought the tickets online or asked for the student discount." Using a truth table to evaluate that argument for validity will produce a final column that ___________________.

A) has eight rows all of which are T
B) has eight rows some of which are T and some F
C) has four rows all of which are F
D) has four rows all of which are T
E) has two rows both of which are T