Tom has twelve slips of paper which he wants to put into five cups labeled $A,B,C,D,E$. He wants the sum of the numbers on the slips in each cup to be an integer. Furthermore, he wants the five integers to be consecutive and increasing from $A$ to $E$. The numbers on the papers are $2,2,2,2.5,2.5,3,3,3,3,3.5,4,$ and $4.5$. If a slip with 3 goes into cup $C$ and a slip with 2 goes into cup $B$, then the slip with 4.5 must go into what cup?