In this type of question , two groups of letters related to each other in same way are given . It is requird to find out this relationship and then choose either a letter-group of a pair consisting of similarly related letter-groups out of the given four alternatives.
BE : AD :: PS : ?

Options

A. LO
B. RO
C. OT
D. OR

Explanation

To solve the analogy question "BE : AD :: PS : ?", we need to identify the relationship between the first pair of letter groups (BE and AD) and then apply that same relationship to the second pair (PS).

### Step-by-Step Solution:

1. **Identify the relationship between BE and AD:**
- Look at the first letters: B and A.
- B is the 2nd letter in the alphabet.
- A is the 1st letter in the alphabet.
- The relationship here is that A is one step back from B (2 - 1 = 1).
- Now, look at the second letters: E and D.
- E is the 5th letter in the alphabet.
- D is the 4th letter in the alphabet.
- The relationship here is that D is one step back from E (5 - 1 = 4).

2. **Apply the same relationship to PS:**
- Look at the first letter: P.
- P is the 16th letter in the alphabet.
- To find the letter that is one step back from P, we subtract 1: 16 - 1 = 15, which corresponds to O (the 15th letter).
- Now, look at the second letter: S.
- S is the 19th letter in the alphabet.
- To find the letter that is one step back from S, we subtract 1: 19 - 1 = 18, which corresponds to R (the 18th letter).

3. **Combine the results:**
- From P, we get O.
- From S, we get R.
- Therefore, the letter group that corresponds to PS is OR.

4. **Final Answer:**
- The answer to the analogy PS : ? is OR.

### Conclusion:
The correct option is OR.