Final answer:
Secretariat won the 1973 c) Belmont Stakes.
Step-by-step explanation:
The legendary racehorse Secretariat won the 1973 Belmont Stakes. The Belmont Stakes is the third and final race of the Triple Crown, which also includes the Kentucky Derby and the Preakness Stakes.
Secretariat is considered one of the greatest racehorses of all time, and his victory in the 1973 Belmont Stakes is particularly memorable because he set a world record time that still stands today.