Force is defined as mass per unit acceleration. As the number of phosphate molecules increases, the charge also increases which increases the force required. The acceleration is dependent on the size of the molecules.

A. True

Explanation: As the charge increases, which is because of the number of phosphate molecules, the size also increases. As, the size increases, it also results in an increase in mass. Thus, now the force and also the acceleration is independent of size until a retarding force is present. But, in the case of gel electrophoresis, the retarding force is provided by gel and thus separation takes place on the basis of size.