Step 1: Write the theka first:
Before looking at the choices, write the theka of Keharwa from memory. It is Dha Ge Na Ti Na Ke Dhi Na, counted in 8 matras.
Step 2: Name each pair:
Break it into pairs of two bols. Dha Ge is item (C). Na Ti is item (A). Na Ke is item (B). Dhi Na is item (D).
Step 3: Read off the order:
Reading the theka from left to right gives C, then A, then B, then D.
Step 4: Match with the options:
Only option 3 reads C, A, B, D. Option 2 runs backwards. Options 1 and 4 have only three items, but the question asks for a sequence of all four pairs.
Final Answer:
Option 3 is correct. \[ \boxed{3} \]