You need to get to class, 200 meters away, and you can only walk in the hallways at about 1.5 m/s. (If you run any faster, you’ll be caught for running.” How much time will it take to get to your class?

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 answer is: c. from underground

Iwas thinking the wavelength is one half its original value