>>937572681. >50% of the students attended every session
2. 100% of <B- missed a session.
From this,
3. <50% of students received <B-
>ANo info about how >B+ is distributed. It could be that only one student got it and also missed every class session.
>B((students <B-) is a subset of students who missed at least one class), so not necessarily
>CThey could have all gotten B-
>DNo idea of the distribution of schedules for >B-
>EThis is the only one you can conclude.
E is the answer.