Why is it important to have a first aid kit on an excavation site?

Having a first aid kit on an excavation site is crucial because it ensures that immediate medical assistance is available in case of an injury. Excavation sites are often high-risk environments where accidents can happen unexpectedly. The presence of a well-equipped first aid kit allows for quick treatment of injuries, which can prevent complications, alleviate pain, and even save lives in critical situations. Access to first aid can stabilize a person's condition while waiting for emergency services, making it an essential resource for maintaining safety on site.

While legal requirements and the need to address minor injuries can be important, the primary reason for a first aid kit's presence is to provide immediate care when injuries occur, making option B the most accurate and significant choice.