Directions: Select the phrase that should replace the underlined portion of the sentence to make it grammatically correct. If no correction is needed, select "No improvement required".

Whenever the diplomat was accompany with his devoted bodyguards, he felt secure venturing into the crowd.

The correct option/answer is was accompanied by his.

Explanation:
Let's analyze the underlined phrase "was accompany with his" step-by-step to understand why a correction is required:

1. Past Participle Form: In a passive voice construction following the auxiliary verb "was", the main verb must be in its past participle form. The past participle of "accompany" is "accompanied". Using the base verb form "accompany" is grammatically incorrect.
2. Appropriate Preposition: The verb "accompanied" naturally collocates with the preposition "by" when referring to the person or group accompanying someone (i.e., "accompanied by his devoted bodyguards"). The preposition "with" is incorrect here.
3. Subject-Verb & Pronoun Agreement: The subject "the diplomat" is singular, which agrees with the singular auxiliary verb "was" and the singular possessive pronoun "his" (supported by "he felt secure" later in the sentence).

Combining these corrections, the underlined phrase should be replaced by "was accompanied by his".

Correct Sentence:
"Whenever the diplomat was accompanied by his devoted bodyguards, he felt secure venturing into the crowd."