Final answer:
Catholic missionaries during European expansion engaged in efforts to convert indigenous peoples with mixed results; resistance was common, with some successful outcomes like the Pueblo Revolt, while missionaries also made strides in understanding and educating the native populations. The correct option is a.
Step-by-step explanation:
The attempts of Catholic missionaries during the European expansion were characterized by efforts to convert the indigenous peoples to Christianity, with varying degrees of success.
In the Americas, Native American populations often resisted the conversion attempts, leading to conflict, and at times retained control of their land, as seen in the Pueblo Revolt of 1680.
Despite this resistance, many missionaries such as the Jesuits and friars, notably Bartolome de las Casas, made significant efforts to understand and educate native populations, creating a complex legacy of the relationship between European colonizers and indigenous peoples. The correct option is a.