Explanation
If a teacher is missing their teaching periods in your school, your duty would typically be A) Will try to know the reason from that teacher.
As a responsible member of the school community, it is important to address any concerns regarding the absence of a teacher during their scheduled teaching periods. You should approach the teacher in question and inquire about the reason for their absence. By doing so, you can gather information and assess the situation to determine if further action, such as informing the principal or seeking assistance from other teachers, is necessary. Ultimately, your aim is to ensure that teaching responsibilities are fulfilled and that students' learning is not compromised.