Step 1: Ṛgveda Priest.
The Ṛgveda hymns and mantras are recited by the Hotā priest. Match: A - II.
Step 2: Yajurveda Priest.
The Yajurveda, concerning sacrificial rituals, is performed by the Adhvaryu priest. Match: B - IV.
Step 3: Sāmaveda Priest.
The Sāmaveda, with its musical chants, is sung by the Udgātā priest. Match: C - I.
Step 4: Atharvaveda Priest.
The Atharvaveda, related to magical hymns and healing, is overseen by the Brahmā priest. Match: D - III.
Step 5: Final Match.
The correct pairings are: A - II, B - IV, C - I, D - III.