Constellation refers to a star, right?

B In ancient China, in order to observe the astronomical phenomena and the movements of the sun, the moon and the five stars, 28 star officials were selected as observation signs, which were called "Twenty-eight Hostels".

C. The constellation originated in Babylon, one of the four ancient civilizations. The ancient Babylonians divided the sky into many regions, which were called "constellations". 1922, the General Assembly of the International Astronomical Union decided to divide the sky into 88 constellations.

D The Big Dipper is a part of Ursa Major, which has a tail and a back, and is named Ursa Major α to η.

So the answer is d.

I hope you can be satisfied ~ ~