Final answer:
Option D is an open-ended question that prompts for details about past actions to increase fiber intake, offering insight into personal habits.
Step-by-step explanation:
The example of an open-ended question from the given options is D. What have you done in the past to try to increase your fiber intake? This question does not have a simple 'yes' or 'no' answer or a limited set of options to choose from. Instead, it requires a more detailed response and allows the person answering to share more information, ideas, or experiences. Open-ended questions are beneficial in surveys, interviews, and discussions as they can elicit comprehensive information, providing deeper insights into the respondent's thoughts and behaviors.