Which of the following statements about the development of language over time is true?
a. languages remain static and unchanging over time.
b. languages can be influenced by internal forces but are rarely affected by outside cultures.
c. most people who speak the same language have identical vocabulary and pronunciation, no matter where they live.
d. languages are always changing and are influenced by trade, communication, and migration.

Languages are never statIc and receive influences throughout time from different issues,such as trade,migration,local typical expressions and even the new technologies influence the way language is developed,introducing new words and expressions.

The answer is (D).

this labor, by slow prudence to make mild.   c. ability to govern well

basic principle: a pronoun usually refers to something earlier in the text (its antecedent) and must agree in number — singular/plural — with the thing to which it refers. the indefinite pronouns anyone, anybody, everyone, everybody, someone, somebody, no one, and nobody are always singular.