A baseball pitcher is frustrated because the batter hit a homerun off of the last pitch. As the batter is running around the bases with a huge grin, the pitcher is given a baseball from the umpire. The pitcher then proceeds to throw the baseball straight upward.

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

Because there is no air in the jar, the vibrations can not travel through the air and create sound.  (that's why there is no sound in space, there is no air)

Igot 56.55 as the anwer