Which of the following statements about stars is true?

a, d, and e, are all wrong, b and c are correct. For b, the earth is rotating so at your particular meridian when a star will be directly above you it will be at it's maximum altitude relative to you. For c Polaris (the pole star) is cirpolar and the altitude of 'Polaris' = latitude of the 'place' you are at, of course this is only true in the northern hemisphere since Polaris in not visible in the southern hemisphere. For a, no matter where you are on Earth you cannot see ALL the stars. For d, this is wrong you cannot see ALL the stars and constellations from the northern hemisphere 'some' in the southern hemisphere (and vice versa) do become visible in winter/summer months due to tilt of the earth. For e, this is not correct , the distance of stars in the celestial sphere vary, the 'sphere' is not limited to a point in space. Hope this is of some help.