An Observer Is Moving in Space Toward a Distant Star

Multiple Choice

An observer is moving in space toward a distant star at 100 km/s while the star is moving toward the observer at 250 km/s;the relative velocity being 350 km/s of approach.What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00 × 10⁵ km/s) .

A) 0.12% increase
B) 0.12% decrease
C) 0.039% increase
D) 0.35% decrease
E) ​0.35% increase