Step 1: Relationship in the given pair.
"Gregarious" and "outgoing" are synonyms — both mean sociable and friendly.
Step 2: Check each option.
- (a) "Groggy" (dazed, weak) and "lucid" (clear) are antonyms, not synonyms.
- (b) "Grouchy" (bad-tempered, irritable) and "irritable" are synonyms. This matches the given relationship.
- (c) "Aggressive" and "extrovert" are not synonyms — they describe different traits.
- (d) "Gritty" (courageous) and "sociable" are unrelated in meaning.
- (e) "Drizzle" and "downpour" are not synonyms; they differ in degree, not equality.
Step 3: Conclusion.
The synonym relationship in option (b) matches best. \[ \Rightarrow \boxed{(b)} \]
Find the missing code:
L1#1O2~2, J2#2Q3~3, _______, F4#4U5~5, D5#5W6~6