According to ohm’s law, resistance is equal to voltage divided by
a. time.
b. conduction.
c. current.
d. potential.

C. current

according to ohm's law, the potential difference (v) between two points is proportional to the current (i)  through the points, where resistance (r) is the constant of proportionality

voltage  = current  × resistance
rearranging it leads to;

resistance = voltage / current