Answer:
it can not go any more
Step-by-step explanation:
7/45 is the simplified terms
Judging by the question I noticed that the two both share x^3 in common. You can divide x^4 by x^3 and get x as a result, and x^3 can still divide into itself.
Thus your answer should be C, x^3
Table B. The same input can't go to different outputs
