While there are over five hundred customers waiting for the grand opening of the supermarket, there are only one cart for every four customers, one-half the number than had been requested based on the results of a company survey.
A. there are only one cart for every four customers, one-half the number than had
B. there is only one cart for every four customers, one-half the number than had
C. there is only one cart for every four customers, one-half the number that had
D. every four customers can have only one cart, one-half the number than had
E. every four customers can has only one cart, one-half the number that had

[spoiler]What if E were can have and not can has..would E be correct?[/spoiler]