Parted blocks are made up of which of the following components?

Parted blocks, typically used in rigging and lifting operations, consist of several key components that allow for effective lifting and pulling of heavy loads. The essential components of parted blocks are primarily pulleys, along with sheaves that rotate within their housing. These pulleys, usually designed to accommodate ropes or cables, significantly reduce friction and allow for a mechanical advantage when lifting or moving heavy objects by distributing weight more evenly across the rigging system.

While the options do mention various items, the option that suggests "The text did not specify" acknowledges that there are no specific details about the components in the provided context. In a practical setting, one would need to refer to detailed rigging texts or specifications to fully understand the structure of parted blocks, because they generally include elements such as sheaves, pins, and frame, in addition to the ropes or cables used to take advantage of the pulleys' mechanisms.

Thus, understanding that parted blocks are not simply composed of cables and hooks or ropes and drones is crucial. It's important to focus on the accuracy of how rigging tools are described and function within lifting practices.