The best answer would be Letter B - to entertain.
The author merely would like to provide amusement to the readers at his expense. It certainly does not persuade, explain, nor inform anything since it states - <span>But why bother with the descriptions; you’ve probably already grasped the idea!</span> - which could be taken as a witticism.
Giving you an idea and information about what the dog will be training to do and helps you to understand a little about the hearing ear association
Answer:
21: C.) while being stranded in the desert
22: C.) He put on food and edible supplies.
23: A.) sarcastic
24: C.) I beat myself up having been ungrateful about being alone because I longed to return to where I was before. (Not sure)
25.) A.) He misses the life he had before embarking on his journey (Most logical answer but B is possible)
