Select the most appropriate option that can substitute the highlighted segment in the given sentence.
She is the least reliablest person of all.

Correct option is C

The correct substitution of the highlighted words is (c) least reliable.
Explanation:
"Least reliablest" is grammatically incorrect because it is a double comparative/superlative. "Reliable" is a polysyllabic adjective and follows the structure:
· Positive: reliable
· Comparative: more reliable
· Superlative: most reliable or least reliable (for negative emphasis)
Grammatical Rule Used:
· Never use double superlatives: Words like more, most, least should not be used with -er or -est endings.
Example: She is the most intelligent (✅), not most intelligentest (❌)
�� Information Booster: Always choose "least + adjective" for negative superlative in polysyllabic adjectives.