From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences I didn't tell my par...

Answer Details

The correct option to complete the sentence is "beside". "I didn't tell my parents about the trip because they would be beside themselves with worry." The phrase "beside themselves" means to be extremely agitated, upset or worried. In this context, the speaker is saying that if they were to tell their parents about the trip, it would cause them to become extremely worried, so they chose not to tell them. The other options, "at", "upon", and "within" do not make sense in this context.