5 A mass of 346 = 2g was added to a mass of 129 + 1g. a What was the overall absolute uncertainty?
b What was the overall percentage uncertainty?

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

The upward force acting on the wing of a airplane in flight is known as the "lift" force. (d)