The telephone, refrigerator and internal combustion engine were all invented in 1876. which would be listed as most important in a presentation regarding the growth of u. s. industry?

The correct answer is Internal combustion engine
Invented by otto to assist in pumping out water from coal mines,the creation of the internal combustion engine and the automobile had a major impact on industry and the processes used by manufacturers. The ford assembly line built to meet the demands of consumers was influenced by the breakthrough in internal combustion engine, a model that was quickly adopted by other factories. Hence, it is correct to say that the internal combustion machine led to the first assembly line which revolutionized production and thus industrialization.

Correct answer for apex is d.