Answer:
Teenagers who are tired are often tardy or fall asleep in class
Step-by-step explanation:
Having enough sleep which enhances better learning outcome as argued by Manjit as a reason for classes not to start earlier than 9a.m, is buttressed and supported by the fact that, not getting enough sleep will make teenagers tired and feel tardy when having early morning classes.
The fact that feeling tired and tardy as in early morning classes, as a result of not getting enough sleep, gives support to one of the reasons she gave, which made her present an argument for classes not to start earlier than 9 a.m.