The correct answer is C) The Spanish missionaries forced Native American's to adopt their religion.
The impact which was a result of the Spanish mission system was that the Spanish missionaries forced Native American's to adopt their religion.
The Spanish conquerors wanted to colonize the Mesoamerica and South American lands to increase the power of the Spanish crown, They realized the many raw materials and natural resources of the Americas and wanted to exploit them for the benefit of the Spanish kingdom and to make good profits.
On the other hand, Spaniards considered that through religion, they could impose strict control over the Native Indians. That is why they sent missions such as the Franciscans that started to evangelize the Indians into the Catholic religion.