In ¹H NMR, the Chemical Shifts for Protons α to a Carbonyl

In ¹H NMR, the chemical shifts for protons α to a carbonyl group ________.

A) are similar for all acid derivatives
B) are farthest downfield for carboxylic acids
C) are farther downfield than those α to a nitrile
D) fall between δ 3.1 and δ 4.2 (ppm)
E) fall between δ 1.3 and δ 1.8 (ppm)