What is the difference of 23x and 9x?

Select one of the options below as your answer:

A. 14

B. 15

C. 14x

D. 15x

The problem wants to calculate the said problem and choose among the following choices that could be the difference of the 23x and 9x. Base on my further computation and systematically figuring it out, my answer would be C. 14x. I hope you are satisfied with my answer and feel free to ask for more

Subtract 9x from 23x yields 14x. This was done by subtracting algebraically the variables.