A. 16.5 billion years
B. 15.5 billion years
C. 13.5 billion years
D. 14.5 billion years
Submitted by: Kashif Ashraf
A. 16.5 billion years
B. 15.5 billion years
C. 13.5 billion years
D. 14.5 billion years
Submitted by: Kashif Ashraf
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