Acar has a mass of 820 kg. it starts from rest and travels 41 m in 3.0 s. what is the force applied to the car?

Assuming constant acceleration, 
s = 1/2 at^2, so 

1/2 * a * 3^2 = 41 
a = 9.111 

And, we all know that F = ma

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