Answer:
The answer is d. social comparison.
Step-by-step explanation:
This concept explains that a person might determine his social worth by comparing himself to others. This might improve or worsen the person's self-esteem and motivation; however, research has shown that the effects of social comparison are mostly negative.
Although it's common that people compare themselves to a person with similar characteristics, the prevalence of mass media has led to comparisons to celebrities, which may cause feelings of stress and inferiority.