Which of the following did Frederick Jones invent?

Frederick Jones is best known for inventing the refrigerated truck unit, which enabled perishable food items to be transported safely over long distances. His innovation was particularly significant for the food industry, as it allowed for the shipping of fruits, vegetables, and meats without spoilage. This invention not only revolutionized food distribution but also made it possible for fresh produce to be available to consumers in regions far from where they were grown. His work laid the foundation for modern refrigerated transport systems used today.

The other options do not accurately reflect his contributions. The lightbulb socket is associated with Thomas Edison, the electric stove was developed by several inventors over time, and the pressure cooker has roots in a number of culinary developments, none of which can be attributed to Frederick Jones.