Social comparison theory suggests that we often learn about ourselves by comparing:

A) one individual's performance with that of another.
B) our present performance with our past performance.
C) our performance with that of other people.
D) different groups to find the one we are most compatible with.

Social comparison theory suggests that we often learn about ourselves by comparing our performance with that of other people. This comparison can be either upward (when we compare ourselves to someone who is doing better than us) or downward (when we compare ourselves to someone who is doing worse than us). By using this information, we can evaluate our strengths and weaknesses, set goals for ourselves, and improve our performance. The other options (A, B, and D) may also involve comparisons, but they are not the primary focus of social comparison theory.