Biology Forums - Study Force

A star is moving toward the Earth with a speed of 0.9 c (90% the speed of light). It emits light, which moves away from the star at the speed of light. Relative to us on Earth, the speed of the light moving towards us (emitted by the star) is 
A) c 
B) 1.9 c 
C) 1.2 c 
D) 0.98 c 

A) c  ⇒ All observers see the speed of light as c
B) 1.9 c 
C) 1.2 c 
D) 0.98 c

Thank you.