sound waves in air are always longitudinal because,
a)of the inherent characteristics of sound waves in air
b)air does not have modulus of rigidity
c)air is a mixture of several gases
d)density of air is very small
transverse wave travel in solids because they have modulus of rigidity but in air their is no modulus of rigidity.
so option is B . if modulus of rigidity is absent then longitudinal waves can travel as in air.