Multiple Choice Question

Joe claims that the equation , where b is a real number, represents the graph of a straight line.

Which statement BEST classifies Joe's claim?
A.
Joe's claim is true only when b is 0.

B.
Joe's claim is true for all values of b.

C.
Joe's claim is not true for any value of b.

D.
Joe's claim is true only when b is not zero.

D. Joe's claim is true only when b is not zero.