What is the work function of the experimental photo-missive material? graph titled maximum kinetic energy of ejected photo electron versus incoming frequency is shown. the y axis is labeled maximum kinetic energy and scales from negative 3 to positive 3 electron volts. the x axis is labeled frequency from 0 to 11 times 10 to the 14 hertz. a line connects the points 0, negative 2 and 2.5, negative 1 and 5, 0 and 8, 1 and 10, 2.
a. 0.50 ev
b.-2.9 ev
c.-1.2 ev d.-2.0 ev

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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