Answer:
A. a concentric contraction because muscles cause the elbow joint and arm to move.
Step-by-step explanation:
Contraction is the phenomenon in which the muscles of our body get activated by the tension produced. When the muscle of our body shortens, caused by the tension applied on our muscle is called concentric contraction. The force produced by the muscle as it shortens bring the cup near our body. There it is an example of concentric contraction.