Which of the Following Statements Is False

Which of the following statements is false?

A) Radioisotope dating of rocks, combined with fossil analysis, is the most powerful method of determining geological age.
B) Earth's magnetic field has changed over time, and evidence of this can be found in igneous and sedimentary rocks.
C) Radioisotope dating can only be performed on rocks or fossils that are younger than the half-life of the decaying isotope.
D) To date sedimentary strata, geologists search for places where igneous rock formations have intruded.
E) Radioisotope dating can be performed on fossils thousands of years old to billions of years old.