Eight students form a math homework group. The students in the group are​ Joe, Earl,​ Zippy, Annette,​ Stinky, Muriel,​ Chet, and Oswaldo. Prior to forming the​ group, Stinky was friends with everyone but Muriel. Muriel was friends with​ Zippy, Annette,​ Chet, and Earl. Joe was friends with​ Stinky, Earl,​ Oswaldo, and Zippy. Letting an edge between two students represent​ friendship, which of the following graphs models the friendships among these​ students?

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