Personification and a surprise ending
The use of "Timothy" implies that Grandfather is merely taking his grandson to the zoo; however, the twist ending is that Timothy is a tiger. Suddenly the reason "no one would share a compartment with them" is all too clear-- no one would want to share a compartment with a large tiger.
Answer:
A) The importance of community.
Explanation:
As the mother desperately informs her neighbors of the missing child, they take initiative to assist her in finding the boy which shows the importance of community because they are willing to help each other in a time of need.