伴随关系是什么关系？？

lunachasedream

Madagascar was one of the last habitable areas of the earth to undergo human settlement, which has made it an ideal site for researching rare flora and fauna.
(A) Madagascar was one of the last habitable areas of the earth to undergo human settlement, which has made it
(B) Madagascar was one of the last habitable areas of the earth to have undergone human settlement, and that has made it
(C) Madagascar underwent human settlement as one of the last habitable areas of the earth, which makes it
(D)  Madagascar, one of the last habitable areas of the earth, underwent human settlement, making it
(E)  Because Madagascar was one of the last habitable areas of the earth to undergo human settlement, it is

正确选E，但是解析说D不对因为underwent human settlemen和making it没有伴随关系是什么意思？！哪样算有伴随关系？？