Read the following passage from the story:
But Grete's words had made her mother quite worried, she stepped to one side, saw the enormous brown patch against the flowers of the wallpaper, and before she even realised it was Gregor that she saw screamed: "Oh God, oh God!" Arms outstretched, she fell onto the couch as if she had given up everything and stayed there immobile.
How has Gregor's mother changed from the beginning of the story?
A. The mother has become terrified of her son's new appearance.
B. The mother has become lazier and doesn't feel like working.
C. The mother has become angrier and more spiteful to her son.
D. The mother is happier and enjoys taking care of her son.
