Which best describes the columbian exchange?
a. the rate at which european currencies were traded for local american products
b. the transfer of people, diseases, plants and animals between the new and the old worlds
c. the conversion of native people to christianity by spanish friars
d. the discovery of the americas by christopher columbus
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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. islands off the coast of newfoundland