On Saturday, the bookstore sold x books. On Sunday, the bookstore sold 3 more books than on Saturday. The expression 2x + 3 represents the total number of books sold over the weekend.


What does the "2" represent in the expression 2x + 3?


A. the number of books sold on Saturday.


B. how much more books were sold on Saturday.


C. the number of days.


D. the total number of books sold.