Step 1: Understanding the question.
The question asks about the winner of the prestigious Booker Prize awarded in 2023. Step 2: Analyzing the options. (A) Salman Rushdie: A past winner but not the 2023 recipient. (B) Margaret Atwood: A notable author but not the 2023 winner. (C) Paul Lynch: Correct — He won the Booker Prize 2023 for his novel \textit{Prophet Song}. (D) Kazuo Ishiguro: A previous winner, not the 2023 awardee. Step 3: Conclusion.
The Booker Prize 2023 was won by Paul Lynch.