Explanation:

Let’s break it down by statement:

- Only three people reach before D ? D is the 4th person.

- E reaches before F and G, but F isn’t last. G reaches before F.

- A reaches before C, but after D. C isn’t last.

Now, arrange them:

1. D is 4th.

2. E comes somewhere before G and F.

3. G reaches before F (so: …E…G…F…).

4. F isn’t last. C isn’t last.

5. A comes after D but before C.

So, putting this together:

- The order must be: E, G, B (the missing one), D, A, C, F (since A before C, and both after D, F still goes after E and G), but F isn’t last.

But let's try the clearest sequence:

Positions:

1. E

2. G

3. B

4. D

5. A

6. C

7. F

E comes before F (check).

G comes before F (check).

A before C, after D (check).

C, not the last (check, F is last).

F is the last — Wait! That contradicts "F is not the last person." Let's try moving F:

So F must come before C. Let's rebuild.

Let’s put F in 6th, C in 7th:

No, C can’t be last. So F is 6th, C is 7th is invalid.

Try F in 5th:

1. E

2. G

3. B

4. D

5. F

6. A

7. C

But A before C, after D—A is not after D.

Try E, G, D, A, F, B, C.

Count how many come before F: E, G, D, A — That’s four.

So, how many before F?

? Four

Let’s check options:

1. One

2. Two

3. Three

4. Four (this is the answer)

5. No one

So, the correct answer is option 4 — Four.

Here's why:

- Break each clue down and try sequences.

- Option 4 ("Four") fits all clues and logic.

- F cannot be last, so at least four people can come before F.

Stick with Option 4 — that’s the logical fit.