The correct answer is D. A small community in Indonesia passes down the art of making batik textiles to younger generations.
Explanation:
Folk culture includes handicrafts, pottery, clothes, music, and other cultural expressions that belong to a specific community. Nowadays, it is difficult for communities to preserve folk culture because due to globalization cultural elements from different cultures are diffused and thus local culture is lost. However, preservation is still possible by teaching younger generations about local cultural elements because, in this way knowledge, practices and techniques of culture remain even if there are external influences.
According to this, the best example of preserving folk culture is "A small community in Indonesia passes down the art of making batik textiles to younger generations" because this shows an attempt to preserve local techniques and handicrafts by teaching new generations about cultural elements.