It’s a independent clause. It has a subject and a predicate/verb.
Collective nouns are always singular
Ex. A flock of birds is migrating to the South.
Answer:
It's (A), Hope this helped you!
Explanation:
B. caught at the office
A phrase is not a sentence and can't stand alone. Caught at the office can't stand alone as a sentence; it is a <u>participial</u> phrase because it consists of a participle (<em>caught</em>) and a prepositional phrase (<em>at the office</em>).
