There are seven persons up on a ladder, A, B, C, D, E, F and G (not in that order). A is further up than E but is lower than C. B is in the middle. G is between A and B. E is between B and F. If F is between E and D, the person on the bottom step of the ladder will be

1. **Anchor**: We have 7 steps. 'B is in the middle', so B is at step 4.\n\n2. **Create the Block**: \n - We are told 'E is between B and F'.\n - We are told 'F is between E and D'.\n - Connecting these, we get a continuous chain: **B — E — F — D**.\n\n3. **Test Direction**: This chain starts at B (step 4). Does it go Up or Down?\n - **Scenario UP**: B(4) → E(5) → F(6) → D(7). \n *Problem*: The question says 'A is further up than E'. If E is at 5, A must be at 6 or 7. But those spots are taken by F and D. This is impossible.\n - **Scenario DOWN**: B(4) → E(3) → F(2) → D(1). \n *Check*: This leaves steps 5, 6, and 7 open for the other people (A, C, G). This works perfectly.\n\n4. **Conclusion**: Since the chain goes down, D ends up at step 1, which is the bottom step.