A stormchaser sees a bolt of lightning strike a cell tower. If the time between the lightning strike and when the stormchaser hears the thunder clap is 2.0 seconds, how far away is the stormchaser from the cell tower?

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

Answerthe distance between the two ends of the galaxy is 150,000 light years;