The Age of Discovery was led by the Spanish Empire mainly, during that same period in Europe there was what is known as the reform and counter-reform, which were a series of ideological and religious conflicts that threatened the stability of the Catholic church.
The Spanish Kings of that time were devout Catholics, in fact they are recognized as the Catholic kings, and it was they who sponsored the travels of Columbus.
For these reasons the Spanish conquerors came accompanied by religious missions that sought to extend dominance
Answer
D christian missionaries set out to convert the indigenous inhabitant of newly discovered lands