The Aerodynamic Diameter,d_ae,of a Particle Is Directly Proportional to Which

The aerodynamic diameter,d_ae,of a particle is directly proportional to which of the following parameters?

A) The square of the particle density
B) The square root of the particle geometric (linear) diameter
C) The square of the particle geometric (linear) diameter
D) The square root of the particle density
E) None of the above