In a Young's double-slit experiment with microwaves of wavelength 3.20 cm, the distance between the slits is 5.40 cm and the distance between the slits and the screen is 140.0 cm. Determine the number of bright fringes on the screen. Assume the screen is long enough to at least show the first order bright fringes.

Uncle grandma

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