问题
In many countries, children must go to school ___________ the age of 5 and 16.
A:In; the comfortable place
B:Of ; the most comfortable place
C:In ; the comfortablest place
D:Of ; the more comfortable place;
B:Of ; the most comfortable place
C:In ; the comfortablest place
D:Of ; the more comfortable place;
正确答案是：
