sputnik the first artificial satellite to orbit the earth was sputnik i, launched october 4, 1957. the mass of sputnik i was 83.5 kg, and its distances from the center of the earth at apogee and perigee were 7330 km and 6610 km, respectively.

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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

Since the pully is a simple machine so the mechanical advantage is a 1