The correct answer is D.
What did you like about your summer vacation?
STEP-BY-STEP EXPLANATION:
Open-ended question: An open-ended question is a question that cannot be answered with a "yes" or "no" response, or with a static response. Open-ended questions are phrased as a statement which requires a response.
Open-ended questions allow respondents to include more information, including feelings, attitudes and understanding of the subject. This allows researchers to better access the respondents' true feelings on an issue.
He used to be embarrassed by his grandpas appearance, but through out the story he learns to cope with who he is and his Indian heritage. He also doesn't mind the medicine bag anymore.