5. The man's problem is that he lost the essential research note for the presentation and also does not have time to research the material again.
The woman and man suggest two possible solutions. The first suggestion is to attend a seminar that deals with the same topic. The second suggestion is to change the order of the presentation with other students.
I think the first suggestion is better for him. This is because the seminar would reduce lots of time to prepare presentation. If he misses the seminar, he would have to squeeze in lots of time for research. Also it's not certain that he will be able to switch his turn with others spots in presentation order with others.
For these reasons, I would recommend the first option for him.
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