In responding to the advocate's prima facie case on the proposition, "Pittsburgh is the most livable city in the United States,"

the opponent argues that "although Pittsburgh may have cultural opportunities, it fails to meet the other tests of 'livability,' clean air, low crime rate, and available housing." The opponent would be using what strategy?
(a) Challenging the definition of terms.
(b) Challenging the criteria of measurement.
(c) Challenging the measurement of the value object.
(d) All of the above

B