According to festinger’s (1954) social comparison theory, people often form judgments about their traits and abilities by comparing themselves with others. according to the theory, this process is most likely to occur when

people have no objective standard by which to judge themselves.    

Explanation:

Social comparison theory: In social psychology, the "social comparison theory" was proposed by Leon Festinger, and is defined as the tendency of an individual to compare himself or herself to that of another person similar to him or her produces accurate or precise appraisals of his or her beliefs and capabilities. It can often lead to weights of uniformity.

The comparison of oneself to others often results in self-motivation, positive self-image, and self-improvement.

In the question above, the statement signifies the occurrence when people have no objective standard by which to judge themselves.

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