Suppose A gets A, then B gets A, C gets A, C gets A, D gets A * * * There are four people who get A, but it says that there are two people who get A, so A can't get A.

Suppose B gets an A, then C gets an A, C gets an A, D gets an A * * * Three people get an A, so B doesn't get an A either.

Suppose C gets A, then D gets A * * * and two people get A, so only C and D get A.