According to the provisions of the Civil Service Law, there is one of the following circumstances between two public officials: (1) the relationship between husband and wife; (2) lineal consanguinity; (3) collateral blood relations within three generations; (4) Those who are related by marriage can't hold direct leadership positions at the same time, can't hold two positions led by the same person in the same department, and can't hold mutually restrictive positions in organization, personnel, discipline inspection, supervision, auditing and finance in the same department.
Therefore, A's wife is in the Environmental Protection Bureau, and Xiao Wang is no longer a department or a superior or subordinate; BCD is consistent with avoidance.