From the words lettered A to D choose the word or group of words that best completes the sentence. The police vehicles raced .. full speed with their sirens...

From the words lettered A to D choose the word or group of words that best completes the sentence.
The police vehicles raced .. full speed with their sirens blaring.

Answer Details

The sentence describes how the police vehicles were racing, and it also indicates the manner in which they were doing so. The best option to complete the sentence is "at." This is because "at" is a preposition that is commonly used to describe the speed at which something is done. In this context, "at full speed" indicates the manner in which the police vehicles were racing. The other options, such as "on," "with," and "in," do not fit in the context of the sentence. "On" and "in" do not make sense because they do not describe the speed at which the police vehicles were racing. "With" could also be a possible option, but it does not fit as well as "at" because "at full speed" is a more common expression in English to describe how fast something is moving.