Some words or phrases have been omitted from each of the following sentences (sometimes two words or phrases). Pick the best answer from A through E below that, when added to the sentence, will complete the meaning of the sentence.
Example:
The opossum is ---- the venom of snakes in the rattlesnake subfamily and thus views the reptiles not as ---- enemies but as a good food source.
(A) vulnerable to..natural (B) conscious of..mortal (C) impervious to..lethal (D) sensitive to..deadly (E) defenseless against..potential