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All hydrogen-1 nuclei consist of a single proton, with spin = $\pm \frac{1}{2}$. All protons are identical. But not all hydrogen-1 nuclei in compounds resonate at the same frequency in NMR spectroscopy.

The primary reason for this is that

A

Differences in local electron density mean that each hydrogen-1 nucleus sees a different local electric field.

B

Differences in local electron density mean that each hydrogen-1 nucleus sees a different local magnetic field.

C

Neighboring hydrogen-1 nuclei, each with its own magnetic field, cause hydrogen-1 nuclei to see a different local magnetic field.

D

Different spectrometers have different magnetic field strengths.

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