It is unknown whether extraterrestrial life exists, but because humans find the idea fascinating to such a large degree, references to alien beings can be found in countless books and movies.


(A) It is unknown whether extraterrestrial life exists, but because humans find the idea fascinating to such a large degree, references to alien beings can be found in countless books and movies

(B) It is unknown whether extraterrestrial life exists or not, but because humans find the idea so fascinating, references to alien beings can be found in countless movies and books

(C) It is unknown if extraterrestrial life exists, but because humans find the idea so fascinating, references to alien beings can be found in countless books and movies

(D) Whether extraterrestrial life exists is unknown, but because humans find the idea so fascinating, references to alien beings can be found in countless books and movies

(E) Whether or not extraterrestrial life exists is unknown, but because humans find the idea so fascinating, references to alien beings can be found in countless books and movies


OA D

Source: Economist Gmat