Stars are astronomical or celestial objects that have self-luminosity and are present in the universe. The composition of a star can be determined by the line spectra. Thus, option B is correct.
What are line spectra?
The line spectrum has been constituted of the emission of the radiations with wavelengths that makes the isolated lines due to the excited atoms emitting various colors.
The spectroscope detects the Fraunhofer lines with various wavelengths and colors. The various constituent particle of the star will produce different colored lines.
The strength, intensity, and color of the spectral line can be used to determine the various components of the star. The emitted lights are compared to periodic characteristics.
Therefore, option B. the line spectrum can determine the composition of a star.
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