Because the group field contains an enabled Other group, ungrouping one of the explicitly grouped members causes that member to be placed into Other. Therefore, A is correct. Tableau groups allow analysts to combine individual members of a dimension into higher-level categories. When the Include "Other" option is enabled, all members that are not assigned to one of the explicitly defined groups are collected automatically into an Other category. Tableau's official Group Your Data documentation specifically describes the behavior of removing members from an existing group. The analyst opens Edit Group, selects the member, and chooses Ungroup. Tableau removes the selected member from its current explicit group. Critically, the documentation states that if an Other group exists, the removed members are added to it. The underlying original dimension member is not deleted. However, option B is incomplete for this exact scenario because the question explicitly states that the Other group exists; Tableau does not merely leave the member ungrouped—it places it into Other. No new single-member group is automatically created, eliminating C, and removing one member does not delete the entire group, eliminating D. This behavior is central to Tableau's dimension grouping and Other-category management.