I understand that you are confused about that question. That is written for leading you to misreading intentionally. First of all, they have the room for up to 100 people. Secondly, they explain how to reserve it. They say you can reserve 3 months before to at least one month. You can get the reservation paper in the office and fill the paper out with writing the date and time on it. Then hand it in to the officer. They put a calendar that is written a schedule of only this month on the wall every first day. Question: you will have a meeting with 80 people on Apr 5th. How to reserve for it? 1. You will write the schedule on the calendar on Feb 1st. 2. You will write the schedule on the calendar on Apr 1st. 3. You will go to the office to get the reservation paper and hand it in after fill it in on Feb 1st. 4. You will go to the office to get the reservation paper and hand it in after fill it in on Apr 1st. The sentences don't say put your schedule on the calendar. So 1 and 2 is incorrect. They say fill the document out and come to the office, but you can make a reservation 3 months before you want to use the room. How come you need to wait until Apr? What are you gonna do if someone reserves it before you do? That's why the correct answer is No.3. Any question? :)

まずは質問の文章の意味を考えて みましょう。 ①４月５日にかいぎをしたいとき、 予約できるのはいつからいつまで？→１月５日～３月２９日。 ② どこでどうやって予約すればいいの？→じむしょでよやくの紙をもらって、その紙に日時を書いて、じむしょに出す。 ③ 予約カレンダーが事務所の前にはりだされるのはいつ？→ ４月１日。 この日に、4月の1ヶ月分の予約がはりだされる。