Of the Following Methods, the Age of the Solar System

Of the following methods, the age of the Solar System can be determined most accurately by

A) measuring the number of craters per square meter on Mercury.
B) radioactive dating of rocks retrieved from the Moon.
C) carbon dating of rocks from mountains on Earth.
D) measurement of the magnetic field variations in rocks under Earth's oceans.
E) measuring the rate of energy production in the Sun.