There's a paperclip like thing
I would go with A. worried.To me, Milton seems worried because he hasn't yet created a great body of work, and he is 23 already. He feels that he should have created something important by that moment, and he is worried that his life is passing by without him accomplishing anything.
2. Failed an exam
3. Had an operation in the hospital
4. Written a love letter
5. Met someone famous
6. Eaten vietnamese food
7. Seen a car accident
8. Been abroad
Science
I say it science because of that clue word scientific information