I think the correct choice would be:
C) He had eaten too much; he felt dizzy.
Answer:She is shy
Explanation: HOPE THIS HELPS
She <span>had been working</span> on the project for 2 days before she finished it. So B is the only right one as it's a continuous action before an action with an exact defining past perfect continuous. Also there's a key word "for" that can help us to find out the tense.
