newton's cradle is a contraption where metal balls hang from a frame. when one ball is pulled and released, the collison causes one ball on the opposite end to be released. which type of force can decrease the total momentum of this system

Inner peace.. jk it's  a stable electron configuration

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

Idk just need points