Which of the following was one reason that europeans began looking for sea routes to asia in the 15th century?
a. europeans wanted an easier way to export goods to asia.
b. europeans wanted an easier way to reach colonies they had in asia.
c. europeans wanted to move to asia to escape problems in their home countries. d. europeans wanted a cheaper way to import goods from asia.

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: