Most geologists think that the movement of Earth's plates is caused by A.
radiation from the sun.

B.
subduction from the ocean floor.

C.
convection currents in the asthenosphere.

D.
Earth's magnetic field created by the Earth's core.

C. Convection currents in the asthenosphere.

Explanation: Most geologists think that the movement of Earth's plates is caused by convection currents in the asthenosphere.

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c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.