Which of the Protons in the Following Molecule Appear Furthest $\quad$

Multiple Choice

Which of the protons in the following molecule appear furthest downfield in the ¹H NMR spectrum? $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ O
$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ ||
$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{C}-\mathrm{O}-\mathrm{CH}_{2}-\mathrm{CH}_{3}$
$\quad$ i $\quad$$\quad$$\quad$ ii $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ iii $\quad$$\quad$ iv

A) i
B) ii
C) iii
D) iv