Given an oil droplet of mass 0.9 mg and density 918 kg/m3 that spreads out into a circle of radius 41.8 cm on the water surface, what is the diameter of the oil molecule?

Hi, your answer is not correct. this is a cumulative  

Answer choices? if there is any

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

Ok what do you need with