Note: payload is not being put into orbit; just delivered. what is the minimum kinetic energy needed to launch a payload of mass m to an altitude that is one earth radius, re, above the surface of the earth (the payload will then fall back to earth)? (note that me is the mass of the earth.)

Try c ? that’s what i got

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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