A15-kg crate (s moved along a horizontal floor by a warehouse worker who Is pulling on it with a rope that makes a 30° angle with the horizontal. The tension in the rope is 69 N, and the crate slides a distance of 10m. (a) How much work is done on the crate by the worker? Assume the coefficient of kinetic friction between the crate and the floor !s 0.4. (b). How much work is done by the normal force? (c). How much work is done by the friction force?

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