In the study of history the available documents for studying a certain period is unchanging over time.
Option: B
Explanation:
History is the study of events and phenomena over space and time. Space means where the particular incident is taking place. Time means the period of occurrence of particular event. A certain period suppose the period of sultanate or mughal empire requires some documents, records to be studied in detail.
And these available documents, records can never be changed over time. History is study of things over changing space and time. Archaeological evidences also keep some valid documents for studying historical events.
Socialism is a range of economic and social systems.
B. Do they could protect their interests from larger states.
Upon taking office, Nixon was obsessed with the idea of winning the Vietnam War. Despite the national protests against increased US involvement in Vietnam, Nixon said that a majority of Americans supported his actions. This term becomes known as the silent majority.
In the beginning, Nixon orders several different means of attacks. This includes the use of Agent Orange, a highly dangerous chemical meant to destroy the Vietcong supplies, and the Christmas Day Bombings in 1972. Despite his best efforts, the US was not going to have success in Vietnam.
This resulted in Nixon developing a new policy of Vietnamization. The goal of this policy was for the US to train the Southern Vietnamese army to handle the fighting on their own. This plan also called for the gradual withdrawal of thousands of American troops.
