1. Which choice completes the text with the most logical and precise word or phrase?

The intergenerational Bulgarian female choir group Bistritsa Babi has been working to preserve customary songs and dances from the Shopluk region of the country since 1939. T hrough these ________ performances, members of Bistritsa Babi hope to keep this centuries-old ritual of expression alive. In 2005, the group was added to the UNESCO List of Intangible Cultural Heritage for Eastern Europe.