A rectangular pasture has a fence around the perimeter. The length of the fence is 16x^7 and the width is 48x^4. What is the area of the pasture?

A. 3x^3
B. 128x^11
C. 768x^11
D. 768x^28

The perimeter of the pasture can be found by adding up the lengths of all four sides of the rectangle. The length of one side is 16x^7 and the width of the other side is 48x^4. Therefore, the perimeter is 2 * (16x^7 + 48x^4) = 32x^7 + 96x^4.

The area of a rectangle can be found by multiplying the length by the width. Therefore, the area of the pasture is (16x^7) * (48x^4) = 768x^11.

Therefore, the correct answer is C. 768x^11.