In order to add a salad bar to a school lunch menu for students with restricted diets, new materials or such as a refrigerator or a bar. its not machines

Perhaps the answer could be equipment or utilities. 
A refrigerator could be considered a utility because it provides you with particular services. It is also equipment because you are equipping the school with it so that students with restricted diets can have their salads and healthier meals.

The answer should be d.

African americans at the time just came out of slavery and needed money to provide for there families. so they joined for the money mainly.