The cotton gin was invented by
a. james hargreaves.
c. richard arkwright.
b. eli whitney.
d. james watt. select the best answer from the choices provided

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

d is the answer. leo should include the source.

they usually pass federal laws

and sometimes in the elections of the president