At a certain store, a cd costs $12. if the cost of cds were graphed as the output, compared to the number of cds purchased as input, which of the following would not be true of the graph?

If these where the choices: 
A. The set of points would all lie on the same line.
B. The set of points would include the origin.
C. The set of points would rise from left to right.
D. The set of points would not graph a function.

My answer would be C.) The set of points would rise from left to right.

Cost of the CDs were graphed as the output, it is y. x would be the number of CDs.

An increase in x will result to an increase in y thus the set of points would rise from left to right.