Final answer:
The element 'c. How a Procrastination App Can Help College Students.' should be enclosed in quotation marks as per MLA citation format for the title of an oral presentation.
Step-by-step explanation:
The student is asking which elements of a works-cited entry for an oral presentation should be enclosed in quotation marks.
According to the MLA format for citing sources, the title of an oral presentation would be an element that should be in quotation marks. Therefore, the element 'c.
How a Procrastination App Can Help College Students.' from the provided options is the one that should be enclosed in quotation marks. This rule is applied because the title refers to a shorter work that is part of a larger collection or event, in this case, an oral presentation. Quotation marks indicate that it is a shorter work within a larger context, such as a single presentation within a professional conference or a panel discussion.