Which one of the following literary works was not written by R.K. Narayan?

R.K. Narayan is a renowned Indian writer known for his contributions to English literature, predominantly set in the fictional town of Malgudi. While he has authored numerous works, here's one literary piece that was not written by R.K. Narayan:

Animal Farm

Animal Farm is a famous allegorical novella written by George Orwell, published in 1945. It explores themes of totalitarianism and revolution through the lens of a farm run by animals who rebel against their human farmer. George Orwell, a prominent British author and journalist, is known for his works such as "Nineteen Eighty-Four" and "Homage to Catalonia."