Come and have a look. We have sweaters _______red, yellow and blue _____ 10 yuan.[ ]

A. at, at              

B. on ,for          

C. in , for        

D. on , at

房地产估价资质等级升级采取依次逐级上升，每次申请升级要间隔两年以上，并不得越级升级。