This block of ice weighs 250 Newtons. What is the magnitude of the force required to lift the block straight up?
How much work would it take to lift it up a distance of 3 meters?
What is the magnitude of the force required to push the block of ice up the incline?
How much work is required to push the block of ice up the incline?

Wooden , walls ,doors ,support

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