Does anyone know the answer ?

B I think  

Not completely sure what log is supposed to mean but

x^3- x^2 =x^1=x                                                

log (x)

Step-by-step explanation:

when we subtract squares we cancel out, when we add we add we just add.

We do not multiply squares we still add them.

We can read (x^3) - (x^2) = x^1

and x^1 = (x)

log (x^3-x^2) is factored

(x) is simplified.