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
My answer is markes ***. I believe this is it because area of rectangle is length times width. Correct me if i'm wrong.