Intense Magnetic Fields Have Been Found to Exist in Sunspots

Intense magnetic fields have been found to exist in sunspots by the observation of what specific physical effect?

A) the Zeeman effect, the splitting of spectral absorption lines
B) Doppler shift of light from sunspots
C) observation of ionized atoms in the region of the sunspots
D) measurement of the relative strengths of spectral absorption lines of gases in the sunspot

Correct Answer:

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