A. Lava flows and sedimentary rocksB. Isotopes that decay at a particular rateC. Iron ore from the center of the earthD. Some of the most primitive material in the Solar system
Meteorites are from space. Therefore they are not from earth. That eliminates A) Igneous lava and sedimentary rock; and also eliminates C) iron ore from the center of the earth. Meteorites also are more than just isotopes of radioactive elements therefore B) is eliminated. D) remains: the most primitive material in the Solar system, dated from 4.4 to 4.6 billion years by isotope ratios.
