Arrange the given steps by which the lungs show inspiration,in the sequence of events occurring first:
$I.$ Increase in the volume of the thoracic chamber in the dorsoventral axis
$II.$ Upward and outward movement of the ribs
$III.$ Contraction of intercostal muscles
$IV.$ Entry of air inside the lungs
$V.$ Contraction of the diaphragm
$VI.$ Increase in the volume of the thoracic chamber in the anteroposterior axis
Choose the correct option.

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