Answer:
The method of reducing cognitive dissonance that Mena is using in this scenario is called "justification of effort." This is when an individual rationalizes their actions or choices by emphasizing the positive outcomes that resulted from their decision. In Mena's case, she is telling herself that finishing the project now will allow her to have the entire weekend free to spend with her friends, which justifies the effort she is putting into completing the project. This way, she can reconcile her conflicting desires to hang out with her friends and to finish her class project.