I need help in this problem:

A 14-foot ladder is leaning against a house so that its top touches the top of the wall. the bottom of the ladder is 8 feet away from the wall. which of these can be used to find the height of the wall?
A. in a right triangle with 14-foot leg and an 8-foot leg, find the length of the hypotenuse.
B. in a right triangle with a 14-foot leg and an 8-foot leg, find the altitude to the hypotenuse.
C. in a right triangle with a 14-foot hypotenuse and an 8-foot leg, find the length of the other leg.
D. in a right triangle with a 14-foot hypotenuse and an 8-foot leg, find the altitude to the hypotenuse.