Can someone please explain it to me why my answer is wrong ??? Where did I do mistake?

Homework: MML 6.4 Fall2021 Part 1 of 3 Points: Use both the washer method and the shell method to find the volume of the solid that is generated when the region in the first quadrant bounded by y = x2, y = 16, and x = 0 is revolved about the line x = 5. . . . . . Set up the integral that gives the volume of the solid as a single integral if possible using the disk/washer method. Select the correct choice below and fill in any answer boxes within your choice. (Type exact answers.) A. 15 x2 dx 0 O B. dy