easy)Can i get out in the daytime NO,the school rules state

easy)
Can i get out in the daytime
NO,the school rules state that no child__be allowed out during the day,unless accompanied by an adult.
a.shall b.need c.will d.can
a
为什么不能选d?
my dog is really fat
you___have given her so much meat
a.wouldn't b.couldn't c.shouldn't d,mustn't
b
答案给的是,shouldn't have done表示本不该干某事
couldn't have done表示本来不能干某事或不可能已干了某事
根据句意：“我的狗太胖了——你本不该给她吃那么多肉的”
不是应该选择c吗?