You put a lot of effort into an assignment and get a C while your roommate, who put in less effort, gets a B+. According to the theory of motivation, your feeling that you have been treated unfairly relative to your roommate makes sense.

Equity theory of motivation

Explanation:

Equity theory is based in the idea that individuals are motivated by fairness, and if they identify inequities in the input or output ratios of themselves and their referent group, they will seek to adjust their input to reach their perceived equity. So the feelings makes sense according to the Equity theory of motivation.

i would say b. research typically uses a variety of sources

the density would be a smaller number.