At a Physiological PH of 7

At a physiological pH of 7.4, amino acids exist as zwitterions because the pK_a of the -NH₃+ group is ____7.4, and the pK_a of the -COOH group is____ 7.4.

A) greater than; less than
B) less than; greater than
C) greater than; greater than
D) less than; less than
E) equal to; equal to