Correct option is A

Logic::
To solve this analogy, we need to understand the pattern or rule that relates the given letter clusters (STEM ↔ HGVN) and (QUIT ↔ JFRG).
Logic: The letters of the given letter clusters and the respective letter clusters are the opposite letter pairs of the English alphabetical order.
Explanation:
S ↔ H; T ↔ G; E ↔ V; M ↔ N
And, Q ↔ J; U ↔ F; I ↔ R; T ↔ G
So, A ↔ Z; C ↔ X; C ↔ X; O ↔ L; U ↔ F; N ↔ M; T ↔ G; A ↔ Z; B ↔ Y; L ↔ O; E ↔ V
ZXXLFMGZYOV is the final answer. So, the correct option is option (a).