Spectral lines are often referred to as the stars' ...

[plus1]

Spectral lines are often referred to as the stars' "fingerprints" because:
A) fingerprints also consist of individual lines that make a pattern.
B) both are unique to their source.
C) both can be easily categorized.
D) both are characteristic of the individual that produced them.
E) All of these are correct.

[notis]

I know the answer! It's E.