An Astronomer Observing Certain Regions of the Sun Through a Spectrometer

An astronomer observing certain regions of the Sun through a spectrometer notices that the spectral lines emitted from these regions are split into two or more components. What does the astronomer conclude about these regions from his observations?

A) The regions contain fast-moving gas.
B) The regions are very hot.
C) The regions contain strong gravitational fields.
D) The regions contain strong magnetic fields.

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