Hello Momo, "Occupation" could be a synonym of "occupancy " and both mean: The act of occupying or taking possession of a building. However they have distinct meanings as well : "occupation" could mean a job or the principal activity in your life that you do to earn money. "His occupation as a photographer requires a lot of traveling ." "occupancy" in the sense of the period of occupying a certain room,building or hotel room in particular.It is characterized by short term in comparison with "occupation". "to be in occupation of a house" means to live in the house , occupy it and inhabit it for longer time. So the correct word to use in your example is (b) "occupancy". San Diego's hotel occupancy is generally quite high and it may be stressful to find a place to stay.

occupation - job: the job by which somebody earns a living - activity: an activity on which time is spent - act of occupying: an act of occupying or the state of being occupied - invasion: the invasion and control of a country or area by enemy forces - time of occupying: the period of time during which something is occupied occupancy - act of occupying: the act or state of occupying something such as a building or an official position - level of occupation: the rate or level of occupation of a place - dwelling place: a building or part of a building where people can live - time of occupying: the period of time during which somebody...