Beyond the basic elements of civilization, what did the Sumerians add to future societies and cultures? A) patriarchy and job specialization
B) social classes and agricultural surplus
C) clearly-defined government and large cities
D) raising livestock and monumental architecture

B) social classes and agricultural surplus

Explanation:

For better or the worse, the Sumerian contribution to the societies and the cultures of the future was agricultural surplus and social classes. When we achieved the level of civilization that made it possible to create the surplus food we in turn made it possible for people to live in larger communities and thus the groundwork for the further development of society was created.

i believe your answer is d)