The sentence that best describes a virtual choir video based on the information in this passage is (D. The whole is greater than the sum of its parts). This sentence means that a group of things or people can achieve more together than they can individually. This applies to a virtual choir video, which is a video that combines the recordings of many singers from different locations into one harmonious performance. Each singer contributes their own voice and style, but the final product is a unified and beautiful piece of music that showcases their collective talent and effort.