a spring balance has a scale pan of 0.4N weight attached to it. A load of 2.0N placed of the pan extends the spring 24mm from its original length. Calculate the load on the scale pan , when the extension is 16mm assuming the elastic limit is not exceeded​

Iwould say a is accurate

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