Final answer:
Tabaqui believes that animals cannot become human, emphasizing the distinction between the two.
Step-by-step explanation:
a) Tabaqui's view on animals becoming human is that no animal has ever become human.
b) This statement relates to the theme of the story by highlighting the difference between animals and humans, emphasizing the boundaries between the two. It showcases the idea that animals and humans have distinct characteristics and cannot transform into one another.
c) Tabaqui might emphasize this point to assert the superiority of humans over animals and to establish a clear divide between the two.
d) This statement reveals that Tabaqui believes in the inherent differences between animals and humans, and potentially supports a hierarchical view where humans hold a higher status.