Question

what did frederick mckinley jones invent in 1940 that revolutionized food distribution?
the flash - freezing process
the concept of dry ice
the refrigerated truck

Explanation:

Frederick McKinley Jones invented the refrigerated truck (or more precisely, the refrigeration unit for trucks) in 1940, which revolutionized food distribution by allowing perishable goods to be transported over long distances. The flash - freezing process was invented by Clarence Birdseye, and dry ice was discovered earlier by other scientists.

Answer:

the refrigerated truck