Answer:
1. A.
2. D.
3. B.
4. D.
Explanation:
1. Scientists confirmed that the color of the hottest star is Bluish-White or Blue
2. Polaris (North Star) helps astronomers and navigators to easily figure out the latitude that helps ships travel across the ocean and can also easily locate North, South, East, and West direction.
3. It is confirmed that the constellation shaped as a mythical hunter is Orion.
4. The largest known star is UY Scuti, but it is not part of the options. Supergiants are the largest known star, options are B, C and D because Arcturus is NOT a supergiant. VY Canis Major is bigger than Betelgeuse and Polaris (North Star).