Explanation:

Let’s analyze the pattern:

- Series: TOR, ?, VQT, WRU, XSV

Let's look at how each letter changes from one cluster to the next:

- T ? V ? W ? X (+2, +1, +1)

- O ? Q ? R ? S (+2, +1, +1)

- R ? T ? U ? V (+2, +1, +1)

So, the jump between first and second is +2 for each letter. After that, it’s +1 each time.

To find the missing cluster after TOR:

- T (+2) = V

- O (+2) = Q

- R (+2) = T

So, the missing cluster is VQT.

But VQT is already present after the missing one. That means, to fit the progression, we need to go backward by 1 step from TOR.

Let’s check the pattern:

From TOR, if we go to previous cluster with same pattern (-2 for each letter):

- T (-2) = R

- O (-2) = M

- R (-2) = P

But this does not match any option.

Alternatively, look at what comes between TOR and VQT:

Between T and V is U.

Between O and Q is P.

Between R and T is S.

Thus, between TOR and VQT, the correct letter cluster is UPS (T?U, O?P, R?S ? +1 for each letter).

Options:

- 1. UPS

- 2. VPS

- 3. VPT

- 4. UNS

Correct Answer: UPS

- Each cluster advances the letters by one step at a time after the first leap of +2.

- The missing cluster must therefore be UPS.

- Option 1 is the correct answer.