circumference is 2 pi r so the r would be 2x so circumference is 4pix but for a quarter of the circle the perimeter is part of a square with side lengths of 2x, so two sides of a square is 4x so 4x+3pix is the unsimplified answer so you can take out the x so it would be x(4+3pi)
tl;dr the answer is A
