To find the area of a parallelogram, you multiply the base by the height. In this case, the base is 9 and the height is 9. Therefore, the area of the parallelogram is 9 * 9 = 81.

However, the given information states that the opposite of the base is 13. This means that the length of the other side of the parallelogram is 13. Since the opposite sides of a parallelogram are equal in length, the base is also 13.

So, the correct calculation for the area of the parallelogram is 13 * 9 = 117.

Therefore, the correct answer is 117, not 99.