suppose the average power consumption per year in a typical house is 345 W. What initial mass of 23592U would have to undergo fission to supply the electrical needs of such a house for a year

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

None. nothing. zero. zilch.

Ray 2 should cross through the focal point on the right side of the lens

Ibelieve the answer is arteries