Which of the following terms refers to using wooden structures or mechanical or hydraulic systems to support the sides of an excavation?

a. Benching.

b. shielding. C.) Shoring.

d. Sloping

I believe the answer is: Shoring

The main purpose of a shoring is to make the foundation of a building become more stable/unshaky. Shoring is usually done during the construction process before the construction workers fully placed a permanent metal structure for the foundation.