A solenoid has 450 loops, each of radius 0.0254 m. The field
increases from o T to 3.00 T in
1.55 s. What is the EME
generated in the coil?
(Hint: What is the area of a circle?)
(Unit = Volts)

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