When did the church begin selling indulgences? what began?

1095

The first known use of plenary indulgences was in 1095 when Pope Urban II remitted all penance of persons who participated in the crusades and who confessed their sins. Later, the indulgences were also offered to those who couldn't go on the Crusades but offered cash contributions to the effort instead.

Explanation:

answer; (d) anthropology;