Which of the following is the BEST summary sentence for the passage?

The second-to-last sentence in the passage best summarizes the main point of the passage: that although The Five mightn't have had solid formal training, they influenced Russian music, and that influence extended beyond their own era. Answer choice "Composers such as Alexander Glazunov, Sergei Prokofiev, and Igor Stravinsky studied under Rimsky-Korsakov." is too specific, and focuses on those who influenced rather than on the actual composers who made up The Five. Because it is the opening sentence of the passage, answer choice "They were known as "The Five": a group of Russian musicians who eschewed rigidly formal classical training and set out on their own to give a new artistic sound to classical music in Russia." is a good option. However, the correct answer choice gets more to the heart of the topic. Answer choice "They were known as "The Five": a group of Russian musicians who eschewed rigidly formal classical training and set out on their own to give a new artistic sound to classical music in Russia." leaves out the formation of long-term influences, so it is not the best option for a summary sentence. It focuses on only two of The Five, so it cannot be a summary statement for the entire passage.