Final answer:
Riverdance first opened in Dublin in 1994, becoming famous for its traditional Irish music and dance with its first performance at the Eurovision Song Contest.
Step-by-step explanation:
Riverdance, the renowned Irish dance theatrical show, first opened in Dublin in 1994 C. The show quickly became famous for its unique and energetic blend of traditional Irish music and dance, characterized by its rapid leg movements while the body and arms are kept largely stationary. Contrary to the options listed, there is no 1995 A or 1995 D; the correct option is C for 1994, which is the year Riverdance was first performed as an interval act during the Eurovision Song Contest and was later expanded into a stage show.