Which of the following is a reason for verifying assist crane loads?

Verifying assist crane loads is crucial during the assembly and disassembly phases as it helps to ensure that the crane operates within its specified capacity limits. When loads are imposed correctly, it reduces the risk of accidents, structural failures, and injuries. By confirming the load during each phase, operators can assess whether the crane will handle the new configurations safely as parts are added or removed. This careful verification process is aligned with established safety practices and guidelines for crane operation, making it essential for effective risk management and safe lifting operations.

The other options, while they touch on important practices and considerations, do not directly address the specific focus of verifying loads during those critical assembly and disassembly phases. This differentiates D as the reasoning that specifically aligns with best practices in crane operation safety.