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.

The North Atlantic may be a (A) weaker climate (B) capacity than previously (C) believed as it is revealed that the ocean’s (D) ally to absorb carbon dioxide has been (E) overestimated.