Final answer:
The correct expression that represents the total perimeter of the farm is P = 2(x + y), choice c).
Step-by-step explanation:
The correct expression that represents the total perimeter of the farm is P = 2(x + y), choice c). This is because the perimeter of a rectangle is calculated by adding the lengths of all four sides. In this case, the expression represents the sum of the lengths of the two sides with length x and the two sides with length y. By simplifying the expression, we get P = 2x + 2y.