Which of these stars is the largest?

The star UY Scuti is considered the largest among the options given. It is a red supergiant located in the constellation Scutum, approximately 5,100 light-years away from Earth. Its enormous size is estimated to be around 1,700 times larger than the Sun, making it one of the largest known stars in the galaxy. Its immense size is a result of its advanced stage of stellar evolution, where it has expanded and swelled up to become a massive star.