If we read the complete exercise, we can understand that the correct answer is 9 students.
This is a math related exercise.
If we take into consideration that Sean is the 5th highest in the class, it means that there are four more people before him.
However, he is also the 5th lowest mark in the class, so it means that there are four more people below him.
If we also count Sean, there are:
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Q1- Urgent / Important
Q2- Writing a paper that is due in 3 hours
(others can wait as no serious consequences but you could fail n get bad mark if you don't complete the paper. It's a deadline issue.)
The answer is D. You should take advantage of the free WIFI.