Final answer:
Alan is described as a 'very average' student who exceeded expectations on an exam, therefore the best answer is C) Very average.
Step-by-step explanation:
Based on the statement that Alan is a very average student but performed quite well on the exam, it suggests that Alan's performance was better than what one might expect from someone with his usual academic record.
The choice that best fits this description is C) Very average, as the statement directly describes him as such and then notes his unexpected performance on the exam, which indicates he performed above his normal level but doesn't necessarily classify him as exceptional, outstanding, or below average in general.