Final answer:
To be able to ask for clarification, have participants expand on their answer, or change the next question based on responses, a researcher should conduct an in-person survey.
Step-by-step explanation:
If a researcher wants to be able to ask for clarification from participants of a survey, have participants expand on their answer, or even change the next question based on their responses, he or she should conduct an in-person survey. In-person surveys allow the researcher to directly interact with the participants, which facilitates better communication and the opportunity for follow-up questions. This type of survey also enables the researcher to observe the participants' body language and facial expressions, providing additional context to their responses.