Directions: Read the following information carefully and answer the questions given below:

Nine containers - P, Q, R, S, T, U, V, W, and X - are placed one above another in a single vertical stack, but not necessarily in the same order. Container R is placed fourth from the top of the stack. Only three containers are placed between container R and container Q, where container Q is kept below container R. Container U is kept immediately below container Q. Container W is placed at the top of the stack. Only one container is placed between container W and container T. Container P is placed immediately above container T. Two containers are kept between container S and container Q. Container X is placed immediately below container S. Container V is placed between container X and container Q.

If all the containers are reordered in alphabetical order from bottom to top, how many containers will remain in their original positions?

The correct option is One.

Step-by-step arrangement of the stack:
There are 9 containers positioned from top (Position 1) to bottom (Position 9).

1. Position of R: Container R is placed 4^th from the top of the stack.
⇒ Position 4 = R

2. Position of Q: Only 3 containers are placed between R and Q, where Q is below R.
⇒ Position of Q = 4 + 3 + 1 = 8
⇒ Position 8 = Q

3. Position of U: Container U is placed immediately below Q.
⇒ Position 9 = U

4. Position of W: Container W is placed at the top of the stack.
⇒ Position 1 = W

5. Position of T: Only one container is placed between W and T.
⇒ Position 3 = T

6. Position of P: Container P is placed immediately above T.
⇒ Position 2 = P

7. Positions of S, X, and V:
• Two containers are kept between S and Q. Since Q is at Position 8, S is placed at Position 5 (8 - 2 - 1 = 5).
⇒ Position 5 = S
• Container X is placed immediately below S.
⇒ Position 6 = X
• Container V is placed between X and Q.
⇒ Position 7 = V

Original Stack (From Top to Bottom):
Position 1: W
Position 2: P
Position 3: T
Position 4: R
Position 5: S
Position 6: X
Position 7: V
Position 8: Q
Position 9: U

Reordering in alphabetical order from bottom to top:
The alphabetical list of containers is: P, Q, R, S, T, U, V, W, X.
Placing them starting from Position 9 (Bottom) up to Position 1 (Top):
Position 9 (Bottom): P
Position 8: Q
Position 7: R
Position 6: S
Position 5: T
Position 4: U
Position 3: V
Position 2: W
Position 1 (Top): X

Comparison of Original and Reordered Positions:
• Position 1: W → X (Changed)
• Position 2: P → W (Changed)
• Position 3: T → V (Changed)
• Position 4: R → U (Changed)
• Position 5: S → T (Changed)
• Position 6: X → S (Changed)
• Position 7: V → R (Changed)
• Position 8: Q → Q (Unchanged)
• Position 9: U → P (Changed)

Only container Q at Position 8 remains in its original position. Hence, only One container remains unchanged.