Which of the following best explains why the rate of decay of Earth′s magnetic field is proof of a young Earth?

Question

Which of the following best explains why the rate of decay of Earth′s magnetic field is proof of a young Earth?

Earth′s magnetic field has weakened since 1835.
At a constant rate of decay, after just a million years Earth′s magnetic field would be almost nonexistent.
The strength of Earth′s magnetic field pulsates and reverses periodically.
The rate of decay of Earth′s magnetic field is constant.

Answer 1

None of these options provide a scientifically accurate explanation for why the rate of decay of Earth's magnetic field is proof of a young Earth. The question appears to be based on a misconception. The age of the Earth is not determined by the rate of decay of its magnetic field. Rather, radiometric dating of rocks and other materials provides strong evidence that the Earth is about 4.5 billion years old. The rate of decay of Earth's magnetic field may provide insights into the geologic processes that affect our planet, but it does not have any bearing on its age.