Answer:
Teddy.
Step-by-step explanation:
Rikki-Tikki-Tavi is a short story written by Rudyard Kipling. The story is about a young mongoose Rikki-Tikki-Tavi, the title character. He has been adopted into a British family after being carried by the floodwater at their doorsteps. The mongoose is loyal towards his friends and family and save them from the vicious snake family of nag and nagina.
After the British family rescued the mongoose he tried making friends with Teddy which frightened him.
So, the person who was afraid of Rikki-Tikki-Tavi was Teddy. Thus the correct answer is option A.