From the words or group of words lettered A to D, choose the word or group of words that best completes the sentence. We were expecting them in the evening ...

Answer Details

The correct option to fill in the blank in the sentence is "at". "At" is used to describe a specific time when something happens, in this case, the time the people arrived was dawn. "On" is used for specific days, and "in" is used for larger periods like months, years or seasons. "For" is used to express duration. Therefore, "at" is the most appropriate option that correctly fits the context of the sentence.