Match the Definition to the Term

Match the definition to the term.
-motion studies

A) a method in which movie cameras were used to record the detailed physical movements required to perform certain tasks,thus revealing how to design machinery and to create methods to make work more efficient and easier for the worker
B) a term to define eighteen independent motions of the hand
C) the impact on performance or behavior of being aware that you are a participant in a study
D) the process of breaking down each task a worker performed into the specific movements it required,and timing each movement