Sound of thunder is heard 5s after the flash of lighting is seen. calculate the distance of nearest point of lighting if the speed of sound in air is 346 ms-1

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

It maybe because uranus is made of gas but uranus has a solid core in the middle