Given conditions:

1. A is above E but below C → $C > A > E$
2. B is in the middle → 4th position
3. G is between A and B → $A > G > B$
4. E is between B and F → $B > E > F$
5. F is between E and D → $E > F > D$

Arranging in order from top to bottom based on the conditions: $C > A > G > B > E > F > D$

The person on the bottom step is D