Arrange these structures as they participate in excitation-contraction.
A. T tubules, sarcolemma, calcium ions, sarcoplasmic reticulum
B. calcium ions, T tubules, sarcolemma, sarcoplasmic reticulum
C. sarcolemma, T tubules, sarcoplasmic reticulum, calcium ions
D. sarcoplasmic reticulum, calcium ions, T tubules, sarcolemma
E. sarcolemma, sarcoplasmic reticulum, calcium ions, T tubules