Final answer:
The rate at which the work moves into the cutter is known as the A) Feed.
Step-by-step explanation:
The question refers to a concept related to the operation of cutting or machining tools. The correct term for the rate at which the work moves into the cutter is Feed. This term specifically denotes the advancement of the workpiece against the cutter and is measured in units of length per revolution (in the case of a lathe or mill) or in units of length per minute.
In contrast, Speed typically refers to the rotational speed of the cutting tool or workpiece itself, expressed in revolutions per minute (RPM). Although both terms are critical in machining operations, they describe different aspects of the process: while feed is concerned with the movement of material into the tool, speed is about the rotational movement of the tool or the workpiece. The answer is option a.