Which of the following shoring materials is used to tightly make up the difference in length of a shore cut slightly shorter than the measured distance for required length and must be frequently checked for tightness?

Correct Answer: Option C — Wedge

Wedges are tapered pieces of wood used in shoring to tighten the fit between a shore and the structure being supported. Because they can loosen due to vibration or structural movement, they must be checked frequently to ensure the shore remains secure and continues to provide necessary support.