Equality is giving everyone the same amount of something. Equity is giving those who are in need more of something in order to help them be equal with others. For example, an equalist will give everyone the same amount of food regardless of their size. An equitist, on the other hand, will give food in accordance to one's size. In my opinion, both have their pros and cons.
I think the answer is D, He organized the Louisiana Purchase
The correct answers are:
(B) Poverty for most Russians
(C) Food shortages
(D) The writing of Karl Marx