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. D E
(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)
(E) Because Madagascar was one of the last habitable areas of the earth to undergo human settlement, it is
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
This option uses the incorrect present perfect tense 'to have undergone'. 'to have undergone' implies that Madagascar is still undergoing human settlement
(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
The red part of the sentence is used as a non essential modifier in this option. This changes the meaning of the sentence. It seems to mean as if because Madagascar underwent human settlement, it is an ideal site.
(E) Because Madagascar was one of the last habitable areas of the earth to undergo human settlement, it is
This option uses the right tense and clearly shows the causal relationship.