Suppose you are in a bus moving at 50km/hr and you threw an orange at 10km/hr to your friend sitting in front of you in the bus at what speed would someone standing by the road measure the speed of orange suppose it was flashlight you shown on your friend what will be your measured speed​

Ibelieve the answer you're looking for is

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