Question

which invention was most important in revolutionizing the meat industry? air brakes knuckle couplers the pullman car the refrigerator car

Explanation:

Air brakes and knuckle couplers improved rail safety/connectivity, and the Pullman car focused on passenger travel. The refrigerator car allowed perishable meat to be shipped long distances without spoiling, enabling national distribution of meat products and transforming the meat industry's reach and scale.

Answer:

the refrigerator car