challenge: According to historical context, what is believed to be the origin of the worship of Vāsudeva and Saṃkarṣaṇa?
  
  A. The worship of a historical figure belonging to the Vrishni clan in the region of Mathura
  B. The worship of a mythological figure from ancient Indian mythology
  C. The worship of a group of five Vrishni heroes
  D. The worship of a deity from a neighboring region
  Answer: 