Explanation:

Here’s the rundown:

- Option 1: Mulk Raj Anand – He’s known for books like "Untouchable" and "Coolie," not "Train to Pakistan."

- Option 2: Khushwant Singh – He’s the one who wrote "Train to Pakistan." It's a classic about the Partition of India and the harrowing experiences of people on both sides. This book is his most famous novel.

- Option 3: Amitav Ghosh – He’s famous for "The Shadow Lines," "Sea of Poppies," and other novels, but "Train to Pakistan" isn’t one of them.

- Option 4: Shashi Tharoor – He’s a well-known writer and politician. Books like "The Great Indian Novel" and "Why I Am a Hindu" are his, but not this one.

To sum up: Khushwant Singh is absolutely the right answer, and your choice lines up perfectly.