The last sentence because it already stated that it has a pattern of bad weather.
Answer: a. role strain.
Explanation:
ROLE STRAIN is a phenomenon that occurs when one is having difficulty meeting the responsibilities of a SPECIFIC role in their life which in this case is that of a student.
The student is required to study hard as well as perform volunteer work as a student meaning the responsibilities might conflict under the SPECIFIC role of student.
This is different from ROLE CONFLICT where MULTIPLE roles conflict each other such as an employee student having the job's responsibilities conflicting with the responsibilities required of a student.
