Historical context provides which of the following pieces of information about an event?
a. many different sources' points of view about it
b. a brief summary of its historical importance
c. an unrealistic or biased interpretation of it
d. the social and economic conditions that surround it

Correct D. The social and economic conditions that surround it.

The historical context of the times in which an event happened will help the historian to understand motives that may have influenced people's actions, as well as relationships between ideas and events occurring within a cultural time and space.  Historical contexts of events in the past differ from conditions in our present context, so it is important to interpret according to context then rather than according to conditions now.

Claude Bélanger, professor of history at Marianopolis College in Canada, explains that historical context "is understood as the events, or the climate of opinion, that surround the issue at hand. They help to understand its urgency, its importance, its shape, or even its timing."  Historical context includes social, political, economic, intellectual, cultural and religious trends that existed when and where the event you're studying occurred.  The historian will want to assess things according to context that existed at that time, rather than judging the past according to context or standards that are in place in our own time, in order to be fair to the persons of that era.

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.