A candle lights a darkened room, emitting a wave of amplitude A. At a distance d, the intensity is I. A second candle emits a wave of amplitude 2A. At what distance from this candle would you need to stand to measure an intensity I.

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

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