The correct option is B GSQNM
Given, HEALTH is written as GSKZDG.
Here each letter is coded as:
Firstly, each letter of the word 'HEALTH' is written in reverse order to get 'HTLAEH'. Now, each letter of the word 'HTLAEH' is moved one step backward to get 'GSKZDG'.
Similarly, the word 'NORTH' is coded as 'GSQNM'.
Hence, option (B) is the correct answer.