Extract:
Which word is used incorrectly in the following sentence?
Moving stealthy, the sneaky little boy reached for the cookie jar on the topmost shelf.
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A
stealthy
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B
sneaky
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C
reached
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D
topmost
The word "stealthy" is used incorrectly; the adverb "stealthily" is required to modify the verb "moving."
A) stealthy
"Stealthy" is an adjective—cannot modify verbs. Adjectives modify nouns; adverbs modify verbs. Correct form is adverb "stealthily" ("Moving stealthily") to describe how the boy moved.
B) sneaky
"Sneaky" is correctly used as adjective modifying "boy." No error affects this modifier placement before the noun.
C) reached
"Reached" is correctly used as past tense verb. No error affects this verb form.
D) topmost
"Topmost" is correctly used as adjective modifying "shelf." No error affects this superlative adjective.
Conclusion
Adjectives cannot modify verbs—only adverbs can. Since "stealthy" attempts to modify the action verb "moving," the adverbial form "stealthily" is grammatically required to describe the manner of movement.