The correct answer to this question is C, 26 inches. Perimeters are the toal distance around the edge of a shape. The perimeter is found by added the length of all the four sides together. In this question, the answer can be found by the following equation: 4 + 4 + 9 + 9. Adding these together equates to the answer 26.
The formal equation for solving perimeter is P = 2(l + w). The two outside of the parentheses indicates it must be multiplied by both the length and the width. This is a math question, which would typically be found on geometry tests.