20. Gasoline-powered, internal-combustion-engine-propelled vehicles had been around for more than a quarter-century by the start of the 1920s, but not until that decade they became a central factor in the everyday lives of ordinary Americans. Mass production, together with innovations in design, engineering, manufacture, and sales brought a new or used car, truck, or tractor within the reach of most people.(A)had been(B)a quarter-century(C)they became(D)brought (E)reach of