A store sells cakes for $10 each, at the following discounts.  \textbf{① $1 off each every Wednesday.}  \textbf{② Buy three or more, $1 off each.}  If both conditions are met at same time, the price can be reduced together.  How much will Tracy pay for 4 cakes at this store on Tuesday? 
选项为:A:$36  B:$40  C:$34  D:$44  E:$30  请回答其中一个选项.