If oil leaks from a tank at a rate of r(t) gallons per minute at time t, what does the change in the rate of oil that leaks per minute O the amount of time it would take for 120 gallons of oil to leak from the tank O the volume of oil in the tank after oil leaks for 120 minutes 120 the number of gallons of oil that leaked from the tank in the first 120 minutes r(t) dt represent? O the amount of time it would take for the tank to have 120 gallons of oil left over after leaking