Correct option is D
The correct option is (d).
Explanation:
The correct sequence is CABD.
- S1 establishes that the protagonist arrived at the hotel.
- C logically follows as the next action: he goes upstairs and knocks on the door.
- A follows C: after knocking, he was 'admitted' into the room.
- B describes what he saw upon entering (Groholsky packing and Liza at the table).
- D describes the reaction of the two characters ('they were both frightened') when he entered.
- S2 explains the reason for their fright described in D.