Why Did the Middle Class Have the Strongest Effect on Production

Why did the middle class have the strongest effect on production in the early 1900s?

A) In general, laborers responsible for production came from the middle class.
B) As the middle class grew in size and prosperity, it demanded more products, increasing production.
C) As the working class grew in size, it decreased in prosperity, making the middle class the most powerful group in society.
D) In the early 1900s, the lower and upper classes virtually disappeared; only a consuming middle class remained, increasing demand for production.
E) As the middle class grew, its need for jobs also grew, so production had to increase to stave off unemployment.