A Star Shows Weak Hydrogen Balmer Lines but Strong Lines

A star shows weak hydrogen Balmer lines but strong lines of neutral sodium. What is a likely explanation for this?

A) This particular star contains no hydrogen.
B) The hydrogen has been ionized.
C) The hydrogen is not receiving enough energy to populate the n = 2 level required for Balmer transitions.
D) The sodium lines are masking the hydrogen lines because these occur at the same wavelengths.

Correct Answer:

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