What is the primary use of a peavey?

The primary use of a peavey is to pry logs onto blocks. A peavey is a traditional logging tool that features a sharp hook and a long handle. This design is specifically intended to allow an operator to lift, pivot, or maneuver logs into position, such as elevating them onto blocks or other supports. This capability is essential during the logging and milling process, as it helps in repositioning logs for further processing or transport while minimizing the need for heavy lifting. The sharp hook at the end of the peavey can grip the log securely, providing leverage for moving it without causing damage.

Considering this, the other options, while related to logging practices, do not reflect the primary function of a peavey. Rolling logs, reducing bind, and cutting logs may involve different tools or accessories that are better suited for those specific tasks. The focus of the question is on the tool's main function, which is effectively prying logs onto other supports, making option C the best choice.