Among the following, which one is not a football club ?

The correct answer is D. Monte Carlo.

Arsenal, Aston Villa, and Chelsea are all professional football clubs based in England. Arsenal is a member of the Premier League, the top flight of English football. Aston Villa is a member of the EFL Championship, the second tier of English football. Chelsea is a member of the Premier League.

Monte Carlo is a city in Monaco. It is not a football club.