Which of the following is a common attachment for a bulldozer?

The common attachment for a bulldozer is a dozer blade. This is designed specifically for dozers and is crucial for their primary function of pushing material, such as soil and debris, during grading, leveling, and clearing operations. Dozer blades come in various shapes and sizes, including straight blades, semi-U blades, and angle blades, allowing for versatility in handling different types of tasks on a job site.

The other choices do not serve as common attachments for bulldozers. A concrete mixer is associated with concrete work, an excavation bucket is typically used with excavators rather than bulldozers, and cranes are heavy lifting equipment that serves a wholly different purpose. Understanding these distinctions helps reinforce the specialized nature of equipment attachments and the specific applications they are designed for in construction and excavation work.