We will use the theorem of remainder to solve the question
Equate x - 3 by 0 to find x
x - 3 = 0
Add 3 to both sides
x - 3 + 3 = 0 + 3
x = 3
Now substitute x by 3 in the polynomial if the answer = 0, then x - 3 is a factor of it
Let start with the first answer

Then (x - 3) is a factor of it
The answer is A