Una pieza de cierto tipo de madera flota en el agua, estando la mitad sumergida debajo del nivel del líquido. Si la misma pieza de madera flotara en gasolina, la parte sumergida de madera debajo de la superficie de la gasolina sería:

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

I’m not sure about this question