Following wwii america entered an age of greatly increased consumer spending which was made more intense by

A golden age essentially. This period of larger spending was spurred by the fact the Americans now had more money to spend. WWII while an awful event, made America into a world superpower. It did this by massively increasing production, more production required more jobs, more jobs required more people, and thus it pulled the common man out of unemployment. 

Your answer is d)magnesium