Which of the Following Temporal Sequences Is Correct for Excitationcontraction $\left[\mathrm{Ca}^{2+}\right]$

Which of the following temporal sequences is correct for excitationcontraction coupling in skeletal muscle?

A) Increased intracellular $\left[\mathrm{Ca}^{2+}\right]$ ; action potential in the muscle membrane; cross-bridge formation
B) Action potential in the muscle membrane; depolarization of the $\mathrm{T}$ tubules; release of $\mathrm{Ca}^{2+}$ from the sarcoplasmic reticulum (SR)
C) Action potential in the muscle membrane; splitting of adenosine triphosphate (ATP) ; binding of $\mathrm{Ca}^{2+}$ to troponin C
D) Release of $\mathrm{Ca}^{2+}$ from the SR; depolarization of the $\mathrm{T}$ tubules; binding of $\mathrm{Ca}^{2+}$ to troponin $\mathrm{C}$