$A$ sample of rock from the moon contains an equal number of atoms of uranium and lead ($t_{1/2}$ for $U = 4.5 \times 10^9$ years). The age of the rock would be:
- A$9.0 \times 10^9$ years
- B$4.5 \times 10^9$ years
- C$13.5 \times 10^9$ years
- D$2.25 \times 10^9$ years
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