Roberta chooses an integer r from the set \{2,3,4,5,6,7,8,9\}, an integer s from the set \{22,33,44,55,66,77,88,99\}, and an integer t from the set \{202,303,404,505,606,707,808,909\}. How many possible values are there for the product r s t ?
Answer Choices
A. 85
B. 81
C. 90
D. 84
E. 80