Final answer:
Among the given options, 'What features are important to you?' is an example of an open-ended question, as it allows for subjective and detailed responses.
Step-by-step explanation:
The examples of open-ended questions from the choices given are B. What features are important to you? This question does not lead to a 'yes' or 'no' answer or a checkbox selection, instead, it invites the participant to provide a more detailed, subjective response that can vary greatly from person to person. Open-ended questions are used in questionnaires to gather qualitative data, which provides a wealth of information from participants' personal views, such as religious beliefs, political views, goals, or morals.