阅读下列短文，从每题所给的四个选项中（A、B、C、D）中，选出最佳选项。

New Zealand Education

Compulsory Education

Compulsory education starts at age 5 and ends at age 16.

Class Size

The number of students in a class is 30 students.

Classrooms

    Students from Years 5-8 stay in the same classroom for most subjects and move to other classrooms only for specific subjects. In Year 9, students take some courses With their homeroom class and some optional classes with students from different classes. Starting from Year 10, students no longer stay in the same classroom most of the time. They go to different classes according to their own choices and abilities.

Term Dates

    A school year starts in January and ends in December. There are four terms in a year. Each term is about 10 weeks.

Class Schedule

    School starts at around 8:30 and ends at 15:15. There are only five periods a day and a period is about an hour long. In the morning, around 10:30, there will be a 20-minute break when students usually have some snacks during this time. There is a lunch period at around 12:40 for about an hour.

Teachers

    Teachers have to teach students of different year level at the same time. Most teachers teach students from at least three to four different year levels. Besides, quite a number of teachers teach more than one subject. This is because the fact that many courses are optional.