Critical Reasoning (CR) | Re: Anthropologists assert that cultures advance only when independence re

"necessary" vs "sufficient"

Passage say- cultures advance only when independence replaces dependence—that is, ONLY when imposition by outsiders is replaced by initiative from within. In other words, the natives of a culture are the ONLY ones who can move that culture forward

Hence, No imposition is a NECESSARY condition.

Now A vs E.
(A) individual schools must be independent of outside imposition
NECESSARY CONDITION - School will progress ONLY when it is independent.

(E) the more independent a school is, the more educational progress it will make
SUFFICIENT CONDITION - If the school is independent, it WILL progress. The more independent, the better. Not at all implied.