Radiometric dating is a technique used to determine the age of rocks. Geologists have used this technique to determine tha O A. Earth is about 4.6 million years old, and life appeared on Earth about 4.4 million years ago. O B. Earth is about 4.6 billion years old, and life appeared on Earth about 4.1 billion years ago. O C. Earth is about 6.2 thousand years old, and life appeared on Earth about 6 thousand years ago. O D. Earth is about 6.2 trillion years old, and life appeared on Earth about 4.9 trillion years ago. O E. The universe started with the "Big Bang."

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