Maria _____ at 6:30 every morning by her mother to get ready for school. [ ]

A. was woken up

B. woke up

C. wakes up

D. is woken up

某同学想估计一小碗大米的数量，他先数出50粒染成红色，然后把这50粒米放回碗中充分搅匀，又随手抓出一把正好120粒米，其中有3粒红色大米，则可估计这碗米约有（     ）粒．