Why Does the S Value Alone Not Provide a Measure

Multiple Choice

Why does the S value alone not provide a measure of molecular mass?

A) It is too difficult to measure.
B) The speed with which a particle travels through a liquid column is not uniform.
C) The velocity at which a particle moves through a liquid column depends on a number of factors, including shape.
D) The velocity of movement accelerates as the particle approaches the bottom of the tube.
E) The velocity of movement slows up as the particle approaches the top of the tube.