"Sufficient" means enough or adequate to meet the needs.
- "Required" refers to something needed but doesn’t fit as well in this context.
- "Demanded" means something that is asked for, but it doesn’t convey the meaning of being adequate for students' needs.
- "Omitted" means to leave out, which doesn’t fit the context.
"Sufficient" refers to having enough of something to meet a particular need or purpose.