Final answer:
The correct action for a room attendant after knocking and saying "Housekeeping" with no response is to knock again. If there is still no answer, they should then unlock the door and enter the room cautiously.
Therefore, option B is correct.
Step-by-step explanation:
When a room attendant knocks on the door of a guest room and says "Housekeeping" but receives no answer, the appropriate action to take is to knock again and announce themselves a second time. If there is still no response, the attendant should then unlock the door and slowly enter the room, ensuring to respect the guest's privacy and security. This standard operating procedure is in place to maintain a balance between providing timely room cleaning services and respecting the privacy of guests. It is also important for the room attendant to be mindful of the hotel's policies and always prioritize guest safety.