Amagnetic field of 37.2 t has been achieved at the mit francis bitter national magnetic laboratory. find the current needed to achieve such a field

If football was tossed in air without gravity or friction the ball would go into space

The speed was not exceeded so it was slow

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