Answer:
G). Mrs. Whitaker's plain attitude toward Galaad's gifts drives him to extraordinary efforts.
Step-by-step explanation:
In the context of the short story 'Chivalry' by Neil Gaiman, the effect that this event causes to the plot is 'Mrs. Whitaker's simple attitude towards the gifts of Galahad operates him to extraordinary efforts.' Mrs. Whitaker is a widow and leads a simple and monotonous life. She is quite happy with living her life in her own way. One day, Galahad(Arthurian Knight) visits him and wishes to get the Holy Trail from her. In order to get it, he makes various exchange offers to her, and when she is not attracted by valuable objects, then he moves on to make extraordinary efforts to get the Holy Trail.