If the recent Harvard study on analyzing social cues is accurate, the difference in comprehension between the Jahai people of the Malay Peninsula and English-speaking Europeans was so pronounced that the gap in an earlier study, done three decades ago by researchers at MIT, between two similar groups, the Kalahari bushmen and English-speaking Americans.

(A) so pronounced that

(B) pronounced to such a degree that

(C) as pronounced as

(D) as pronounced that

(E) pronounced;

OA C

Source: Veritas Prep