A wave with a frequency of 500 Hz is traveling at a speed of 200m/s. what is the wavelength of this wave?

No because scientist are still changing there mines today so they are not correct to this day

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

This question is incomplete and not physics but i'm  willing to if you can give a better question