Option A is correct: The Hallisalasya painting, found on the outer wall of the continuous verandah connecting Caves 4 (known as the Rang Mahal) and 5 of the Bagh Caves in Madhya Pradesh, depicts a joyous folk dance. The mural vividly portrays a ring of female dancers keeping time by striking small wooden sticks together, highly reminiscent of the modern *Dandiya* or *Garba*. They are accompanied by female musicians playing instruments such as the hand-drum (*hudukka*) and small cymbals (*kamsyatalas*). It is highly valued by historians for its detailed depiction of ancient central Indian social life. Option B is incorrect: Although the Bagh Caves are ancient rock-cut Buddhist viharas dating back to the 5th–6th century CE (Gupta period), the Hallisalasya painting is a secular scene depicting social life, not a depiction of the Buddha in a meditative pose. Option C is incorrect: The depiction of Shiva and Parvati on Mount Kailasha is a famous theme in Hindu cave architecture (such as at Ellora or Elephanta), but it is not the subject of the Hallisalasya mural in the Buddhist Bagh Caves. Option D is incorrect: Samudramanthan (Churning of the Ocean) is a prominent Hindu mythological event depicted in various temples and sculptures, but it is not represented in the Hallisalasya painting. Therefore, Option A is the correct answer.