Directions: In the following question, a sentence with a highlighted phrase is provided. Select the most suitable replacement from the options below to make the sentence grammatically correct and contextually meaningful. If the highlighted phrase is correct as it stands, select "No correction required".

As the mayor was escort with her trusted advisors, she walked confidently through the crowded city hall.

The correct answer is was escorted by her.

Step-by-Step Explanation:

1. Analyze the Original Sentence:
Original Sentence: "As the mayor was escort with her trusted advisors, she walked confidently through the crowded city hall."
The highlighted phrase is "was escort with her".

2. Identify the Errors:
• Verb Form Error: The sentence is written in the passive voice because the mayor is receiving the action from her advisors. A passive structure using the auxiliary verb "was" requires the past participle form of the main verb ("escorted"), not the base form ("escort").
• Preposition Error: To introduce the agent performing the action in a passive voice construction, the correct preposition is "by" rather than "with" (i.e., "escorted by").
• Subject-Verb & Pronoun Agreement: The subject "the mayor" is singular and referred to later as "she". Therefore, the singular past auxiliary "was" and singular possessive pronoun "her" are correct.

3. Evaluate the Given Options:
• were escorted by her: Incorrect. The plural verb "were" does not agree with the singular subject "the mayor".
• is escort with her: Incorrect. Uses the present tense "is", the incorrect base verb form "escort", and the incorrect preposition "with".
• No correction required: Incorrect. The original phrase contains verb form and prepositional errors.
• was escorted by their: Incorrect. Uses the plural possessive pronoun "their" which does not match the singular pronoun "she/her" referring to the mayor.
• was escorted by her: Correct. Properly utilizes the past participle passive verb "was escorted", the correct preposition "by", and the proper singular pronoun "her".