The correct answer is: B. motion study
Motion study is a technique used to improve the efficiency of a process by analyzing the movements of workers and identifying ways to eliminate wasted motion. It is a type of work study, which is a broader term that includes both motion study and time study.
Time study is a technique used to measure the amount of time it takes to perform a task. It is used to determine the standard time for a task, which is the amount of time that a qualified worker should take to perform the task at a normal pace.
Merit rating is a system used to evaluate the performance of employees. It is used to identify employees who are performing well and those who need improvement.
In motion study, workers are studied at their jobs and all their movements and motions are noted. The goal is to identify wasted motion and find ways to eliminate it. This can be done by changing the way the task is performed, by using different tools or equipment, or by rearranging the work area.
Motion study can lead to significant improvements in efficiency and productivity. It can also help to reduce fatigue and injuries.