Final answer:
The USS Constitution was christened on October 21, 1797, and she is celebrated for her role in the War of 1812.
Step-by-step explanation:
The USS Constitution, known as "Old Ironsides," was one of the first frigates built by the early U.S. Navy and has become an iconic symbol of American naval history. The correct date when the USS Constitution was christened is October 21, 1797, which corresponds to option (a). This ship played a significant role during the War of 1812, where it notably evaded the British fleet for fifty-seven hours under Captain Isaac Hull and outran the best navy in the world at that time, contributing to American national pride.