The first guess is: a and C.

The second place was guessed: B.

The third place was guessed: A and B.

The fourth place was guessed: e and d.

The fifth place was guessed: Ding and C.

Everyone guessed right in every ranking, so the second place can only be B, so the third place can only be A, and so on.

A is the third place

B is the second place

C is the first place.

Ding is the fifth

E is the fourth place.