Whats the answer the of the question

It would be D, because if you divide them you would end up with something that looks like this:

x (2x-1)

(2x-1)

Then if you cross out both of the two 2x-1, all that is left is the x.

X(2x-1)/(2x-1)
(2x^2-x)/(2x-1)
(2xx-x)/(2x-1)
So you can remove something if it's the same under and above.

-(1)x/-1 = x