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In carbon-13 NMR spectra, chloroform-d ($CDCl_3$) appears as a triplet at about 77 ppm.

This is because

A

hydrogen atoms are decoupled from carbon-13, and this causes deuterium to show as a triplet.

B

deuterium nuclear signals are split by attached carbon-13 nuclei.

C

carbon-13 nuclear signals are split by attached deuterium nuclei.

D

carbon-13 nuclei are split by all attached hydrogen atoms, whether protium or deuterium, but the splitting is much larger for deuterium and is therefore visible.

E

deuterium's NMR resonance frequencies overlap with the resonance frequencies of carbon-13 atoms.

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