Correct option is C
Step 1 (Fix F): "Only 3 vendors sold less than F".
Order (6 slots): _ > _ > F > _ > _ > _
(F is at Rank 3).
Step 2 (The Bottom Half): "D sold less than F but more than C and A". "A > C".
So, D > A > C.
This fills the bottom 3 slots perfectly: _ > _ > F > D > A > C.
Step 3 (The Top Half): "E did not sell the most".
Remaining vendors: B and E.
Since E isn't #1, B is #1 and E is #2.
Final Sequence: B > E > F > D > A > C.
Conclusion: If B sold 20, E must have sold less than 20 (e.g., 18 or 19).
B is the Topper. E is second. E<20.