A possible ranking is 1, 3;

B The possible rankings are 2, 3 and 4;

C The possible ranking is 1, 5;

D the possible ranking is 5;

E The possible rankings are 2, 4.

Because every ranking was guessed right, so:

The fifth place is d.

So 1 is: C.

So the third place is: a.

The remaining 2 and 4 are B and E respectively.

If you add a condition to the question, everyone will guess at least one place correctly.

Then according to what E said, we can know that B is not the fourth, so B is the second.

So e is the fourth.

Namely: CBAED