Answer:
The correct answer is D.
Explanation:
A confounding variable is a variable that you didn’t account for. It is when an experimenter cannot tell the difference between the effects of different factors on a variable. This method is used to influence the outcome of experimental design.
Frequency of attending religious services
The first and second stages consisted of the concurrent establishment of missions to civilize the native Indians and military reservations, called presidios, to guard the missions and settlers against hostiles. The third stage was the civil portion, consisting of the establishment of farming communities called pueblos.