Which pair of symbols below show different isotopes of the same element?

(A) |
^{39}_{18}A and ^{39}_{19}R |

(B) |
^{60}_{27}X and ^{59}_{28}Y |

(C) |
^{12}_{6}L and ^{14}_{6}L |

(D) |
^{37}_{17}X and ^{37}_{17}X |

(E) |
^{3}_{2}E and ^{3}_{1}G |