Derek is a gymnast, and his favorite event is the rings. To score well, he is required to hold a position for several seconds before continuing into the next move. In his favorite move, he performs shoulder abduction to form a "T" and then holds it without moving. While Derek is holding this position, what type of contraction is his deltoid performing? A. An eccentric contraction B. A concentric contraction C. A static contraction D. A dynamic contraction