英语奥赛题I really don't think Rosemary will be upset,but I'll go

英语奥赛题
I really don't think Rosemary will be upset,but I'll go and see her in case she--------A,is B.does C.will be D.hae been
为什么选B?be upset 不是要用A吗?
Tell----you like-it makes no difference to me.
A.who B.whom C.whoever D.no matter whom
为什么选C？不选D是因为whom的原因吗？