When Hailey told her roommate about the chemistry test she had just completed, she knowingly exaggerated its difficulty. Subsequently, her memory of the test was that it was as difficult as she had reported it to be. This best illustrates.

the misinformation effect

Explanation:

The misinformation effect: In psychology, the term is described as the propensity of any post-event or situation information to hinder or interfere in the original event-related memory. It causes the development of inappropriate memories, and often the formation of false memories.

The misinformation effect is considered to be a good example of retroactive interference. An individual experiencing the misinformation effect encounters memory impairment due to the exposure to misleading information.

In the question above, the statement best illustrates the misinformation effect.