Explanation:

- Let's analyze the statements:

- At least six persons buy books after H, so H is among the first three.

- Two persons buy books between H and C.

- M buys after F and before E, so "F M E" is in sequence.

- No more than two people are between C and E.

- A buys before G and after H, so "H A G" is in order.

- G isn't last, and fewer than three people are between G and B. B is before G, but not first.

- Arranging nine persons:

- H must be first.

- Following statements, a possible order is: H A C F M E G K B.

- The correct answer is option:1, K, as K is the first person in the arranged order.