Antonyms — Identify the option that is the closest opposite in meaning to ‘‘GULLIBLE’’ (credulous vs. skeptical; common vocabulary trap).

Given data

• Adjective: GULLIBLE = easily deceived; credulous
• Options: Incredulous; Fickle; Easy; Stylish

Concept/Approach
The antonym must show skepticism or unwillingness to believe without proof. ‘‘Incredulous’’ means disbelieving; skeptical.

Step-by-step reasoning
Gullible (believes too readily) ↔ Incredulous (hard to convince).‘‘Fickle’’ = changeable; ‘‘Easy’’ and ‘‘Stylish’’ are off-topic semantically.

Verification/Alternative
Pairing check: credulous ↔ incredulous is a standard antonym pair.

Common pitfalls
Reading ‘‘incredulous’’ as ‘‘incredible’’ (amazing); they differ in meaning and part of speech.

Final Answer
Incredulous