Just for my own notes: most students attended each class session, those who got a grade below B- did not attend at least one.

no matter what, if u got lower than a B- you did not attend all the classes. safe to assume, that if you attended all classes then you got a B- or higher. Even if you got a B- or higher, you still could've missed a class.

Just because you missed a class, doesn't automatically mean you got lower than a B-. It's just that if you got lower than a B-, by facts, you did not attend all the classes.

i, too, got this wrong, twice