Each question is divided into four parts where one of the parts may or may not contain an error. Choose the part that has the error as your answer. If all the 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)

The correct answer is B.

Step-by-step Explanation:
1. Analyze the sentence structure: The sentence discusses how the speaker performed an action: "The speaker delivered her presentation so confident...".
2. Identify the part of speech needed: The word in question modifies the verb delivered, describing the manner in which the presentation was given. In English, verbs must be modified by adverbs, not adjectives.
3. Spot the error: Part (B) uses the adjective "confident" instead of the adverb "confidently".
4. Formulate the correction: Changing "confident" to the adverb "confidently" makes the sentence grammatically correct: "...delivered her presentation so confidently that the...".