Mass production resulted in
a. less affordability of goods.
c. reduced prices of goods.
b. higher costs of production.
d. decreased standards of living.

Mass production means that more  goods can be produced cheaper (so answer b, and therefore a are incorrect) which means that people would be able to afford these goods easier, afford more goods, better quality of goods and generally have a better quality of life (so answer d is false).

The correct answer is c.

A. less affordability of goods