Plzz -
after world war ii, many wartime factories that produced metals, gasoline, and rubber
a. were forced to close.

b. hired more female employees.

c. began producing consumer goods.

d. remained open to produce these goods for civilians.

Answer D. Remained open to produce these goods for civilians

After WWII the US experienced a huge economic growth consolidating its position as the world´s richest country. Most of the production was concentrated in goods and services increasing the middle class in US, so these factories remained open to continue producing goods for civilians.