The book A suitable Boy was authored by _______________ in 1993.

The correct answer is Vikram Seth.

Explanation:
A Suitable Boy is a celebrated novel written by Indian author Vikram Seth and published in 1993. It stands as one of the longest novels ever published in a single volume in the English language.

Key Context and Information:
• Plot Summary: Set in post-partition, newly independent India (around the early 1950s), the story revolves around four interconnected families. The central plot follows Mrs. Rupa Mehra as she searches for a "suitable boy" for her 19-year-old daughter, Lata, to marry.
• About the Author: Vikram Seth is a widely acclaimed Indian poet and novelist. In addition to A Suitable Boy, his notable works include The Golden Gate (1986) and An Equal Music (1999).

Brief Overview of Other Authors Listed:
• Arundhati Roy: Famous for her Booker Prize-winning novel The God of Small Things (1997).
• Salman Rushdie: Renowned for Midnight's Children (1981) and The Satanic Verses (1988).
• Kiran Desai: Known for winning the Booker Prize with The Inheritance of Loss (2006).