This would most probably be Latin: It was the language at the Universities during this time, and also in the church.
In fact, some remnants of this can still be found. In some universities some very formal documents can still be written in Latin and some church celebrations can still be led in Latin in some churches.
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Answer:
C = A missionary is best described as an individual sent on a religious mission.
Explanation:
A missionary is best described as an individual sent on a religious mission. specially one sent to promote Christianity in a foreign country.