Which two stars are notable for being part of the constellation Ursa Major?

Mizar and Alcor are notable stars in the constellation Ursa Major, with Mizar being the brighter component of a double star system (the more prominent of the two when observed) and Alcor serving as the fainter companion. Mizar is often recognized in popular culture; for instance, it's frequently referred to in educational contexts as a "pointer star" toward the North Star, Polaris, due to its position in the Big Dipper asterism, which is part of Ursa Major. The two stars have historically been used as a test of eyesight, where seeing both together reflects good vision.

The other star pairs listed in the options belong to different constellations. Pollux and Castor are part of the constellation Gemini, Betelgeuse and Rigel belong to Orion, while Vega and Antares are part of Lyra and Scorpius, respectively. Thus, Mizar and Alcor distinctly represent Ursa Major and are often highlighted for their visibility and significance in the night sky.