Answer:
C. Shoring.
Step-by-step explanation:
The term Shoring is defined as the construction of a temporary structure to support temporarily an unsafe structure. This type of support structure is oriented towards the field of construction in general, and it may be made out of wooden or metallic materials.
Since Shoring can be applied generally in construction, it is fair to implement it in an excavation, and therefore this term satisfies the concept given in the question.