Research on Multiple Attachments in the First Year of Life

Research on multiple attachments in the first year of life indicates that

A) infants have an attachment hierarchy in which their first attachment object remains their most preferred companion
B) infants have an attachment hierarchy in which the person who feeds them remains their most preferred companion
C) different attachment objects serve different functions, typically with fathers being preferred as protectors and comforters and mothers being preferred as playmates
D) different attachment objects serve different functions, typically with mothers being preferred as protectors and comforters and fathers being preferred as playmates