Suppose you work in the E$.$R$.$ and a choking patient comes in with their trachea obstructed. The diameter is $\frac{1}{3}$ of what it was before the obstruction. You manage to correct the problem and send them on their way safely, explaining that such obstructions are particularly dangerous because $q,$ the blocked airway passes only $\frac{2}{3}$ the regular amount of air.

the blocked airway passes only $\frac{1}{27}$ the regular amount of air.

the blocked airway passes only $\frac{1}{3}$ the regular amount of air.

the blocked airway passes only $\frac{1}{81}$ the regular amount of air.

$$ the blocked airway passes only $\frac{1}{9}$ the regular amount of air.