The Gap Between the Higher Equilibrium Tuition and Lower Student

Multiple Choice

The gap between the higher equilibrium tuition and lower student tuition is $4,000 at university A and $10,000 at university B.  It follows that

A) if the supply of openings at each university is the same, then the demand to attend university B must be higher than the demand to attend university A.
B) the supply of openings is necessarily larger at university A than B.
C) instructors at university B are likely to be more punctual for their office hours than instructors at university A.
D) instructors at university A are more likely to be punctual for their office hours than instructors at university B.