Answer: J This office closes for holidays, and sometimes it closes for staff meetings.
Step-by-step explanation:
The first option uses the conjunction "for" to combine to two sentences. When you read it out loud, "for sometimes" is not very fluid. This probably isn't our answer.
Staff meetings are not holidays, so option G does not apply because it uses the conjunction "so" to combine the two sentences.
Since the office closes for both holidays and staff meetings, option H does not make sense because it uses the conjunction "or" to combine the two sentences.
This leaves us with our answer, Option J:
"This office closes for holidays, and sometimes it closes for staff meetings."