Arrange the following steps of muscle contraction in the sequence of events occurring first:
$I.$ Receptor sites on sarcolemma
$II.$ Nerve impulse
$III.$ Release of $Ca^{2+}$
$IV.$ Acetylcholine release
$V.$ Shortening of sarcomere
$VI.$ Synaptic cleft
$VII.$ Spread of impulse over sarcolemma on $T$-tubule
The correct option is:

• A
  $II \rightarrow IV \rightarrow VI \rightarrow I \rightarrow VII \rightarrow III \rightarrow V$
• B
  $II \rightarrow IV \rightarrow I \rightarrow VI \rightarrow VII \rightarrow III \rightarrow V$
• C
  $II \rightarrow IV \rightarrow I \rightarrow VI \rightarrow VII \rightarrow V \rightarrow III$
• D
  $IV \rightarrow II \rightarrow I \rightarrow VI \rightarrow VII \rightarrow V \rightarrow III$