A pump is used to pump water up a hill to a height of 200 meters. The mass flow rate of water is 2 kg/s. the pipe through which the water is flowing has a diameter of 2 inch. Water enters the pump at atmospheric pressure and leaves pipe as atmospheric pressure

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

They like garbage and they hunt during the night.

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