How have scientists determined the earth's core is composed of iron and nickel?

The correct option from the given options is: "Scientist have determined the composition of Earth's core by using radiometric dating to examine meteorites".
To date materials the procedure of radiometric dating or radioactive dating is used, for example, rocks or carbon, in which trace radioactive impurities were specifically fused when they were framed. The strategy looks at the abundance of a normally happening radioactive isotope inside the material to the abundance of its decay items, which shape at a known consistent rate of decay.