4. The star Sirius is 8.6 light years away from Earth. This means


A. that the light we see from SIRIUS at this very moment left that star 8.6 years ago travelling through space at 300, 000 km/sec.

B. that we will see the light from SIRIUS 8.6 years from now as its light travels through space at 300, 000 km/sec.

C. that the light we see from SIRIUS at this very moment has to travel 8.6 years to reach Earth by 2028.

D. that SIRIUS star shall move closer to Earth by 2028 as it travels through space at 300,000 km/sec. ​