The Alpha star (the brightest) in the constellation of Orion shifts its position

Question

The Alpha star (the brightest) in the constellation of Orion shifts its position on the celestial sphere by 0.03 arc seconds per year and the Beta star shifts by 0.001 arc seconds per
year. Based on this observation, which of the following conclusions is justifiable?
a. The spectral lines from the Beta star are more red-shifted.
b. The spectral lines from the Alpha star are more red-shifted.
c. The shifts in position do not provide information on the speed along the line of sight, therefore we can not draw any conclusion on the shift of the spectral lines.
d. Since any shift is at right angles to the line of sight there should be no shift in spectral lines

Explanation / Answer

c. The shifts in position do not provide information on the speed along the line of sight, therefore we can not draw any conclusion on the shift of the spectral lines.

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