In certain code TRIPPLE is written as SQHOOKD. How DISPOSE can be written in that code ? 

Correct option is D

​TRIPPLE → SQHOOKD 

1. T → S → -1

2. R → Q → -1

3. I → H → -1

4. P → O → -1

5. P → O → -1

6. L → K → -1

7. E → D → -1

Each letter is replaced by the previous letter in the alphabet (i.e., -1 shift).

​So, DISPOSE → CHRONRD​