The mother said to her son, “You must go the school and remain there till I come to receive you.”

A. The mother told her son that he must go to the school and remain there till I come to receive you.
B. The mother told her son that he should go to the school and remain there till she come to receive him.
C. The mother told her son that he might go to the school and remain there till she come to receive him.
D. The mother told her son that he might go to the school and remain there till she came to receive him.