Final answer:
The correct answer to the question depends on the specific policies of the housing community, with a common scenario being that housing is open during the summer break and apartment communities often stay open year-round.
Step-by-step explanation:
The question "Arroyo Vista remains open during _____ and all apartment communities are open ________" is asking for specific information regarding accommodation availability during certain periods. Assuming Arroyo Vista is a housing community at a college, the correct answer would depend on the policies of the particular institution. However, a common scenario could be that housing remains open during the summer break for students who need to stay on campus for various reasons and that most apartment communities are likely to be open year-round to accommodate students and faculty, as well as possible summer programs.