Who invented lightning rods to protect buildings from lightning?
a. van de graaff
b. benjamin franklin
c. william gilbert
d. charles de coulomb

Benjamin Franklin invented lightning rods to protect buildings from lightning in the 1700's.

Hope this helps .

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