In the sentence, certain words are in bold and numbered from A to E, which are the possible pairs to be interchanged. Choose the pair(s) of words which need to be interchanged to make the sentence grammatically correct and meaningful. 

All the (A) incoherent of dream life are (B) explicable as the (C) peculiarities effort, due to some (D) physiological stimulus, of certain organs, or of the (E) cortical elements of a brain otherwise asleep.