51.When an organism dies, its muscles remain in a contracted state termed "rigor mortis" for a brief period of time. Which of the following most directly contributes to this phenomenon? There is no
(A) glycogen remaining in the muscles.
(B) ATP to move cross-bridges.
(C) ATP to break bonds between the thick and thin filaments.
(D) oxygen supplied to muscle.
(E)calcium to bind to troponin.