Step 1: Understanding the question.
Epsom is a town in Surrey, England, famous for the Epsom Downs racecourse, which hosts the Epsom Derby, a major horse racing event.
Step 2: Analyzing the options.
(A) Horse racing: Correct — Epsom is widely known for its association with horse racing, particularly the Epsom Derby.
(B) Polo: Epsom is not particularly associated with polo.
(C) Shooting: Epsom is not known for shooting sports.
(D) Snooker: Epsom is not known for snooker.
Step 3: Conclusion.
The correct answer is (A) Horse racing, as Epsom is primarily associated with horse racing.