Which of the following is a type of emergency equipment commonly found in the field?

First aid kits are vital components of emergency equipment commonly found in the field because they provide essential medical supplies and tools necessary for treating injuries and illnesses in emergencies. These kits typically include items such as bandages, antiseptics, gauze, scissors, and pain relievers, all crucial for addressing various health issues that may arise in unexpected situations.

In contrast, gardening tools, construction materials, and office supplies do not serve the primary purpose of emergency response. Gardening tools are used for horticultural tasks, construction materials are meant for building projects, and office supplies are associated with administrative functions. None of these items provide the immediate medical assistance needed in emergency scenarios, reinforcing why first aid kits are the correct answer in this context.