Answer:
The perimeter of a square is given by the formula P = 4s, where s is the length of one side.
Here, one side of the square is given as 14x + 14 feet. Substituting this into the formula, we get:
P = 4(14x + 14) feet
P = 56x + 56 feet
Therefore, the answer is option B: 56x + 1 feet.