Answer:
Officials at the press conference gave little detail.
Step-by-step explanation:
Prepositions are words that we use to tell the position of a noun or a pronoun in a sentence. It also tells the relation of words or elements in a sentence. Examples of prepositions are "at, for, by, above, below, near, to, after" etc.
The given sentence "officials ... the press conference gave little detail" will have the preposition "at". This is because the preposition "at" tells the location, place, or time of an event. And the officials were "at" the press conference, which is a location or a place.
So, the final sentence will be-
Officials at the press conference gave little detail.