Match the following groups of words with the correct one-word substitutions.

Phrase	One-word substitution
A. the act of looking into one's mind	1. hallucination
B. pleasure mixed with sadness at recalling happy moments in the past	2. reverie
C. a false perception of things that do not really exist	3. introspection
D. a state of absent-minded daydreaming	4. nostalgia

Correct option is C

The correct one-word for the given group of words is:
· A- Introspection: The act of looking inward or examining one's thoughts. (आत्मावलोकन)
· Example: He spent the evening in deep introspection.
· B- Nostalgia: A sentimental longing for the past. (पुरानी यादों की कसक)
· Example: The old photographs filled her with nostalgia.
· C- Hallucination: A false sensory perception of objects/events that do not exist. (भ्रम, मृगतृष्णा)
· Example: He had hallucinations due to high fever.
· D- Reverie: A daydream; a state of being pleasantly lost in thoughts. (खयालों में खो जाना)
· Example: She slipped into a reverie during the lecture.
Meanings of the other options:
· (a) A-4, B-2, C-3, D-1 – Incorrect because A is not "nostalgia", and B is not "reverie".
· (b) A-2, B-1, C-4, D-3 – All mismatched.
· (d) A-3, B-2, C-4, D-1 – C and D mismatched.