The correct answer is: C. reciprocal of inductance.
In the force-voltage analogy, force is analogous to voltage, and velocity is analogous to current. The viscous friction coefficient is a measure of how much resistance there is to motion, and it is analogous to the reciprocal of inductance. This is because inductance is a measure of how much resistance there is to changes in current, and the viscous friction coefficient is a measure of how much resistance there is to changes in velocity.
Option A, charge, is incorrect because charge is not analogous to any of the quantities in the force-voltage analogy. Option B, resistance, is incorrect because resistance is analogous to the viscous friction coefficient, not to charge. Option D, reciprocal of conductance, is incorrect because conductance is the reciprocal of resistance, and resistance is not analogous to any of the quantities in the force-voltage analogy. Option E, none of the above, is incorrect because the viscous friction coefficient is analogous to the reciprocal of inductance.