下列具有社会行为的有 [ ]

A．在同一片森林筑巢的喜鹊

B．个体户在河边养的一群鸭

C．一群南飞的大雁

D．一块稻田里的所有青蛙

What do you think of the hotel? Wonderful. You couldn't have found _____. [ ]

A. a good one

B. a better one

C. a best one

D. the best