Barium-137 Emits a Gamma Ray in the Decay from an Excited

Barium-137 emits a gamma ray in the decay from an excited state $\left({ }^{137} \mathrm{Ba}^{*}\right)$ . What is the resulting daughter nuclide?

A) $136 \mathrm{Cs}$
B) $137 \mathrm{La}$
C) $137 \mathrm{Ba}$
D) $137 \mathrm{Cs}$
E) $136 \mathrm{Ba}$