Which of the Following Is NOT True Regarding American Dialects

Which of the following is NOT true regarding American dialects?

A) Regional dialects in the U.S. continue to thrive; thus, U.S. speech is not becoming more homogenous, as many predicted
B) A singular Standard American English has never been formally declared in the U.S.
C) Similar to Gullah, the structure of African American English reflects its origins in both English and West African languages
D) Historically, there have been more regional dialects found on the West coast than on the East coast of the U.S., due to migration patterns
E) The pin/pen merger is a non-standard linguistic feature found in the parts of the American South