Final answer:
The Winter Triangle is formed by the bright stars Sirius, Betelgeuse, and Procyon, making option c the correct answer.
Step-by-step explanation:
The three bright stars that mark the points of the famous Winter Triangle are Sirius, Betelgeuse, and Procyon. Therefore, the correct answer to the question is option c. Procyon, Betelgeuse, and Sirius. The names of these stars have origins in ancient times, and many come from Arabic. Sirius means "the scorched one," Betelgeuse means "right hand of the central one," and Procyon is also one of the closest stars to our solar system, located within 26 light-years of the Sun.