A \( _{\text{29}}^{\text{68}}\text{Cu} \)
B \( _{\text{29}}^{\text{65}}\text{Cu} \)
C \( _{\text{29}}^{\text{63}}\text{Cu} \)
D \( _{\text{29}}^{\text{59}}\text{Cu} \)
Correct Answer: Option D
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