Which detail from the article illustrates that not all of the Marfa lights are caused by headlights from a nearby highway? A The balls of light remain motionless and pulse on and off, switching from faint t B Robert Ellison saw the Marfa lights in 1883 while driving cattle, before cars were invented. C The lights are the size of soccer balls in bright colors of red, orange, green, blue, white, or yellow. D There are too many conflicting theories, so there will never be a definitive answe their origin.​