Professor Brandt is conducting a study on ___. He shows his study participants a picture of an adult-child pair. He tells half of the participants that they are looking at a parent and her child. He tells the other half that they are looking at a daycare worker and a child in the daycare center. The group that thinks the pair is related rates them as looking more alike than the group that thinks they are NOT related.

perceptual sets.    

Explanation:

Perceptual set: In psychology, the term perceptual set is determined as an individual's susceptibility or predisposition to perceive or recognize specific things in a certain manner or way. In other words, the perceptual set is described as an individual's propensity to notice only a few aspects of a particular object and therefore ignoring all other aspects or details.

In the question above, the given statement signifies that Professor Brandt is conducting a study on the perceptual sets.              

fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.

sumerians were polytheistic, meaning they believed in many different gods. so, the best answer is c.