Q. Find the odd number / letters / word from the given alternative:

Explanation by: Mr. Dubey

Let's analyze the options:
Den: A den is a home or shelter for certain animals, like a lion or bear.
Roof: A roof is part of a building, not necessarily associated with animal homes.
Burrow: A burrow is a home or shelter typically used by small animals like rabbits or rodents.
Nest: A nest is a home for birds or other animals.
The odd one out is Roof because it refers to a part of a human-made structure, while the others (Den, Burrow, Nest) are natural shelters used by animals.
So, the correct answer is: (B) Roof.