Answer 'c' is the correct dimensions.
Work Step by Step
Let $x$ inches be the width of the rectangle. Since the length is twice the width, length = $2x$. For the perimeter of the rectangle, $2(x + 2x) = 24$ $6x = 24$ $x = 4$ The dimension of the rectangle is 4 inches by 8 inches. Answer 'c' is the correct dimensions.