English Grammar – Spot the error (choose the erroneous segment or ‘‘No error’’). Sentence: Unintentionally I let out the secret by talking about it loudly in the library.

Introduction / Context:
This sentence checks idiomatic verb–particle usage and adverb placement. The phrasal verb “let out (a secret)” is idiomatic, and the adverbs are in natural positions.

Given Data / Assumptions:

• Phrasal verb: “let out” meaning “reveal”.
• Manner/place adverbs: “unintentionally”, “loudly”, “in the library”.
• Clause sequence is straightforward and logical.

Concept / Approach:
There is no grammatical or idiomatic error: “Unintentionally” (fronted adverb) is fine; “let out the secret” is correct; “by talking about it loudly in the library” is a sound prepositional phrase of means, with adverb “loudly” placed naturally before the prepositional phrase of place.

Step-by-Step Checks:

Verification / Alternative check:
Paraphrase: “I accidentally revealed the secret by talking about it loudly in the library.” Grammar remains correct.

Why Other Options Are Wrong (as error picks):
Each segment is acceptable; therefore, the only correct choice is “No error.”

Common Pitfalls:
Overcorrecting idiomatic phrasal verbs; assuming fronted “Unintentionally” is wrong—fronting is permitted and common for emphasis.

Final Answer:
No error.