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should have --- help please

should have --- help please

hi all friends
i really miss u all ,, but in fact i have a awful work days
any how
i need a fast reply (if u please) Smile about the rule here:
look at this dialoge

Woman: "What did the weather forecast say for today?"
Man : "It said there was an 80% possibility of rain"
Woman: "Oh, I ------ have brought my raincoat:

to fill that space we have 4 choices
a- must b- may c- should d- could

the right answer is :
c- should

but why? ,,, what is the rule of using "should have" if there is one
& if there isn't ... why the right selection is "should"
waiting for your response (as i used) Smile
thanx in advance
sherif Smile