The answer is D because dilation means to get bigger. I remember it like how a vagina gets bigger before having a baby so it dilates. Multiply all edges by 3 and the correct answer is D
C, I remember doing this test
the answer is 23.2558139535
First you need to simplify the left side of the equation to get

Then you add by two on both sides to get

Finally you divide by 2 on both sides to get