What do the following phrases mean “ i am still a beast at bay.”

What can you infer about gregor from this excerpt? a. he is ungrateful and refuses to eat all of the food that grete brings for him b. his appetite is good, which shows that his body is trying to return to human form c. he always eats trash, and grete is trying to get him to remember being human d. his eating habits are changing, and he is becoming physically less human