Final answer:
The number of different hydrogen environments can be inferred from the NMR spectrum.
Step-by-step explanation:
The number of different hydrogen environments can be inferred from the NMR spectrum (option d). In nuclear magnetic resonance (NMR), hydrogen atoms in different chemical environments will have different resonances, which can be observed in the NMR spectrum.
Each peak in the spectrum corresponds to a different hydrogen environment, providing information about the number of unique hydrogen environments in a molecule.