Each question is divided into four parts where one of the parts may or may not contain an error. Choose the partthat has the error as your answer. If allthe parts are correct choose

“No Error”.

The speaker delivered her (A)/ presentation so confident that the (B)/ entire audience was captivated by her words, (C)/ nodding in agreement and appreciation. (D)

To identify the part of the sentence containing the error, let us analyze the grammatical structure of the sentence step-by-step:

1. Examine Part (A): "The speaker delivered her"
This part introduces the subject ("The speaker") and the transitive verb ("delivered") along with the possessive pronoun acting as a determiner ("her"). There are no grammatical errors in this segment.

2. Examine Part (B): "presentation so confident that the"
Here, the noun "presentation" is followed by the intensifier "so" and the adjective "confident".
The word "confident" is an adjective, which is used to describe a noun (e.g., "a confident speaker"). However, in this context, the word is intended to modify the verb "delivered" in Part (A)—describing how the speaker delivered her presentation.
To modify a verb, we must use an adverb rather than an adjective. Therefore, the adjective "confident" should be replaced with the adverb "confidently".
The corrected phrase should read: "...presentation so confidently that the..."

3. Examine Part (C): "entire audience was captivated by her words,"
This clause is in the passive voice ("was captivated by her words"), which correctly matches the past tense of the main verb ("delivered"). The structure is grammatically sound.

4. Examine Part (D): "nodding in agreement and appreciation."
This part features a participle clause ("nodding...") that correctly modifies the audience's action, and the parallel structure of the nouns ("agreement and appreciation") is correct.

Conclusion:
The error is in Part (B) because the adjective "confident" is incorrectly used instead of the adverb "confidently" to modify the verb "delivered".

Therefore, the correct option representing the part with the error is B.