Which of the following events triggers the subsequent steps of excitation-contraction coupling?
A. Release of calcium ions from the terminal cisterns of the sarcoplasmic reticulum
B. Propagation of an action potential along the sarcolemma and T tubules
C. Binding of calcium ions to troponin, which removes the blocking action of tropomyosin
D. Release of acetylcholine from axon terminals at the neuromuscular junction
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