The kinetic energy of the ejecta from a supernova explosion is about 10^44 joules. use the formula for kinetic energy to determine the typical speed at which matter is ejected from a supernova with a mass of 10 m sun. compare that speed with the sun's orbital speed around our galaxy. based on your comparison, do you think the galaxy's gravity would be strong enough to retain the supernova debris if there were no interstellar medium to slow it down? explain

The answer is a.  i hope this

Ithink it is c ,i hope i you

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

Your answer is 120miles