In the 19th century, the belief was that production creates its own demand. By the early 20thcentury, American companies began to produce more goods than buyers could consume. At the same time, competition became more significant. The usual solution was to hire more salespeople to find new buyers. This describes the era.

The Sales Era.

Explanation:

The Sales era was the era that began after the production era. The sales era, in the marketing, was the era in which the companies began producing goods in mass volume. It was an era of unorganized market where companies were competing with each other significantly, Selling of mass products became difficult. New marketing strategies emerged because of this to persuade customers to buy their products.

The era that is defined in the question refers to the sales era.

So, the correct answer is the Sales era.

the answer would be a).