Explanation:

Let’s break it down:

- ?? Ahmed Ali wrote "Twilight in Delhi." It’s a major novel that explores life in Delhi before Indian independence, focusing on cultural and social shifts.

- Amrita Pritam is a celebrated Punjabi writer, best known for her poetry and the novel "Pinjar"—not "Twilight in Delhi."

- Khushwant Singh wrote "Train to Pakistan," a classic about the Partition, but not this novel.

- Krishna Sobti is known for her sharp Hindi prose and novels like "Zindaginama," but again, not "Twilight in Delhi."

So, you got it: Ahmed Ali is the author you’re looking for.