Two air-track carts move toward one another on an air track. Cart 1 has a mass of 0.27 kg and a speed of 0.99 m/s. Cart 2 has a mass of 0.66 kg. Part APart complete What speed must cart 2 have if the total momentum of the system is to be zero

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The answer is d) by requesting advice on science internet sites

The relationship of both of them

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