A) \[{}^{12}{{C}_{6}}\,\,and\,\,{}^{14}{{C}_{6}}\]
B) \[{}^{235}{{U}_{92}}\,\,and\,\,{}^{236}{{U}_{92}}\]
C) \[^{1}{{H}_{1}},{{\,}^{2}}{{H}_{1}}\,\,and\,\,{}^{3}{{H}_{1}}\]
D) \[{}^{40}A{{r}_{18}},\,\,and\,\,{}^{40}C{{a}_{20}}\]
E) None of these
Correct Answer: D
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