When does Mary decide to approach Guenevere with her problem in King Arthur's Socks: A Comedy in One Act? after Vivien leaves, when Guenevere is alone during Vivien’s visit, when Lancelot’s name is mentioned after Vivien’s visit, when Arthur returns from his trip during Vivien’s visit, when Guenevere is darning socks THE ANSWER IS WHEN GUENEVERE IS ALONE . someone said B and D were wrong C was wrong also.