Which Occurrence Led Astronomers to the Conclusion That the Temperature

Which occurrence led astronomers to the conclusion that the temperature of the gases in the solar corona was very high?

A) detection of emission lines from highly ionized elements like iron
B) measurement of the brightness and spectrum of the continuum visible light from the corona during eclipses
C) direct measurements using space probes exploring the corona
D) observation of the effect of these gases on the planets Mercury and Venus

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