Calculate the drag force on the bacterium as it swims. Use \eta = 0.001 ~\text{N s/m}^2η=0.001 N s/m 2 for the viscosity of water. Give your answer in units of picoNewtons (1 ~\text{pN} = 10^{-12} ~\text{N})(1 pN=10 −12 N) and report your answer as a negative number to indicate that the force is resistive (against the motion of the bacterium).

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current

Ithink the answer is fusion