What Is the Observed Feature That Suggests That Mercury's Iron

What is the observed feature that suggests that Mercury's iron core is molten?

A) presence of a global magnetic field
B) background sloshing sound in radio transmissions sent back by the Mariner 10 spacecraft
C) irregularities in Mercury's rotation rate
D) extensive lava flows near the regions of greatest tidal stress, such as the Caloris Basin

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