‘X’, born in the UK, was conferred the Nobel Prize in 2025. He was a professor in an American university when this prize was announced. Identify ‘X’ :

• The 2025 Nobel Prize in Physics went to John Clarke, Michel H. Devoret and John M. Martinis for demonstrating macroscopic quantum tunnelling and energy quantisation in an electric circuit — the foundation of superconducting quantum computers.

• John Clarke was born in Cambridge, England, and is a professor at the University of California, Berkeley — he fits both clues (UK-born, professor at an American university).

• Michel Devoret was born in France; although he too works at American universities (Yale, UC Santa Barbara), the UK birth clue rules him out.

• Richard Robson, a 2025 Chemistry laureate for metal-organic frameworks, is UK-born but a professor at the University of Melbourne, Australia; Joel Mokyr, a 2025 Economics laureate at Northwestern University, was born in the Netherlands.

• Hence option (c).