A. Yes. The Spanish missionaries wanted to convert, practice and expand Roman Catholicism throughout the new world.
B. No, they considered the native Americans non-religious and lacking in a culture that promoted exploitation of resources. Such as ranching and farming.
C. Yes, as part of assimilation. The Spanish living throughout North America, would naturally find that they could promote peace and tranquility by establishing one language, providing missions, forts for protection of the local populace and by marriage.
D. No, The European invasion of the America's were an expression of the need for more land for the existing European population. The Spanish wanted more, more Land, more Wealth. Not more soldiers