Study the following information carefully and answer the questions given below.

Seven boxes- A, B, C, D, E, F and G are kept one above another in a single stack but not necessarily in the same order.
Only two boxes are kept between box A and box F. Box B is kept two boxes above box F. Only three boxes are kept between box B and box G. The number of boxes kept above box G is one more than the number of boxes kept below box C. Box D is kept two boxes below box C. Box E does not kept below box D.

If all the boxes are arranged in alphabetical order from top to bottom, then how many boxes remain unchanged in their position?

The correct answer is Two.

Let us determine the correct sequence of the boxes from top to bottom (positions 1 to 7) step-by-step based on the given clues:

1. Box B is kept two boxes above box F:
This means the arrangement must look like: B, _, F.

2. Only two boxes are kept between box A and box F:
This gives us two cases:
- Case A: A is above F. Since B is two boxes above F, A must be above B, leading to the sequence: A, B, _, F.
- Case B: A is below F. The sequence becomes: B, _, F, _, _, A.

3. Only three boxes are kept between box B and box G:
- In Case A (A, B, _, F), G must be below B (since B is near the top). So, G is placed at the 4th position below B, giving: A, B, _, F, _, G (6 boxes).
- In Case B (B, _, F, _, _, A), G is placed at the 4th position below B: B, _, F, _, G, A (6 boxes).

4. Let's test the remaining conditions on Case B (B, _, F, _, G, A):
Since there are 7 boxes, there is one more position to be determined. Let the positions from 1 to 7 be:
Pos 1: _
Pos 2: B
Pos 3: _
Pos 4: F
Pos 5: _
Pos 6: G
Pos 7: A

5. The number of boxes kept above box G is one more than the number of boxes kept below box C:
- From the arrangement, G is at position 6. The number of boxes above G is 5.
- Therefore, the number of boxes below C must be 5 - 1 = 4.
- For C to have exactly 4 boxes below it, C must be placed at position 3.

6. Box D is kept two boxes below box C:
- Since C is at position 3, D must be at position 5 (3 + 2 = 5).
- Now, the remaining empty position is 1, which must be occupied by E.

7. Verify the remaining condition: "Box E is not kept below box D":
- E is at position 1 and D is at position 5. Since E is above D, this condition is satisfied.

The final arrangement from top to bottom is:
1. E
2. B
3. C
4. F
5. D
6. G
7. A

Now, let's compare this arrangement with the alphabetical order (A to G) from top to bottom:

Original Position vs. Alphabetical Position:
Position 1: E vs. A (Changed)
Position 2: B vs. B (Unchanged)
Position 3: C vs. C (Unchanged)
Position 4: F vs. D (Changed)
Position 5: D vs. E (Changed)
Position 6: G vs. F (Changed)
Position 7: A vs. G (Changed)

Therefore, only two boxes (B and C) remain unchanged in their positions.