Which of the bold and underlined carbon atoms would be the most shielded in ¹³C NMR?

Name: Which of the bold and underlined carbon atoms would be the most shielded in 13 C NMR?
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Question

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The most shielded carbon atom in ¹³C NMR is typically the one that is least electronegative and has the most electron-donating groups attached. In option B, the carbon in CH₃CH₂NH₂ is bonded to an amine group, which is less electronegative than oxygen, providing more shielding compared to the other options.

Which of the Bold and Underlined Carbon Atoms Would Be