The correct option is C Normally shy participants may find it easier to "speak" in this setting.
Virtual focus groups have some advantages, such as making it easier for shy or reticent people to participate in the relatively anonymous setting of an online discussion. However, the method also has numerous disadvantages that stem from this lack of face-to-face interaction: it is more difficult to build rapport online and so the researcher may find it harder to prevent people from dominating the discussions, ignoring questions or dropping out of the study altogether.