Because of the automobile industry, United States' fourth-largest city was Detroit, which was in the year 1930. Hence, Option A is correct.
What is the automobile industry?
When a company that is involved in the activity which is related to the manufacturing of the motorvehicles and the parts or the components that are related o it are known as the automotive industry. The parts that are prepared or manufactiured by the company are engines and batteries. The parts that are required by the company but are not manufactured by them are tires, batteries, and fuel.
This automobile industry sector is very huge or can be said as one of the vast areas in which organizations or companies are involved in all kinds of activities that are right from designing to the selling of the ultimate product involves. The most common names of the industry are Toyota, Honda, Volkswagen, Nissan Motors, and Hyundai.
Thus, Option A is correct.
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