How did the growth of the rail networks impact the meatpacking industry? a) the meatpacking industry shrank because the demand for other natural resources increased. b) the meatpacking industry grew because the cattle population increased. c) the meatpacking industry grew because railroads were used to deliver large quantities of meat from processing plants to locations across the country. d) the meatpacking industry shrank because there was no safe way to transport meat on rail cars.