Historians use terms such as a. d., b. c., decade, and century
a. to us locate ourselves in space.
b. to refer to periods of time.
c. to define the term odyssey.
d. to identify ancient civilizations.

How are the republican and democratic presidential candidates chosen? a. they are nominated by their state governments. b. each is nominated by his or her respective party. c. each is chosen by the governor of his or her home state. d. they are chosen by the house of representatives.