Thinking that she had outperformed most of her classmates, glenda was surprised to receive just an average grade on her psychology test. glenda's experience best illustrates:

Overconfidence

Explanation:

According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question Glenda's experience best illustrates Overconfidence. This is formally defined as the tendency to exaggerate the correctness or accuracy of our beliefs and predictions. Which is what Glenda is doing by thinking that she is going to get an amazing grade on the test because she is outperforming her classmates.

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