Alice is building a​ fenced-in pen in her backyard for her ​dog, as shown. Write an expression that represents the total amount of fencing she will​ need, in feet. If the longer dimension of the rectangle is 27 ​feet, how many feet of fencing does Alice ​need?
A. 4x + 26
B. 4x + 52
C. 2x + 26
D. 2x + 13