Question

what might keep a conquistador from converting the native he encountered
a. conquistadors were not religious
b. the unconverted could be used as slaves
c. the native religions seemed more appealing
d. conquistadors often converted to native religions

Answer 1

Conquistadors were definitely not under the appeal of the native religions, quite to the contrary, they would look down on them.

The reason was that as long as the natives were not Christians they could be used as slave labour: the correct answer is B.

Answer 2

B.  the unconverted could be used as slaves