18. In a solution of aspartic acid (pKa=7.4) adjusted to a pH of 2.74,
(A) the ration of asparate to asparatic acid is 10 to 1.
(B) the ration of asparate to asparatic acid is 100 to 1.
(C) the ration of asparate to asparatic acid is 1000 to 1.
(D) the ration of asparate to asparatic acid is 1 to 10.
(E) the ration of asparate to asparatic acid is 1 to 100.