The correct answer would be C.
I'll walk you through it.
Sasha has a unknown value to represent her number of cookies before any were added. Lets make that unknown value ten.
She ends up getting two more cookies to add to the ten, so lets make a note of that. We can prove that the answer is twelve because the starting value was chosen and addition is used.
10 + 2 = 12 (which is x)
She also ends up getting twelve more cookies, so lets make a note of that as well. The question asks that the sum is two times the amount of x.
12 (which is x) + 12 = 24
In order to see if our answer is correct, now we have to divide twenty-four by twelve.
24 / 12 = 2
With this division, we now know twenty-four is two times the amount of twelve, and therefore we can conclude the answer is C.
