IBPS Clerk Mains 8 Oct 2022 Paper

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. 
Despite this (A) unidentified and the efforts of thousands of scientists working to (B) ward off dangerous new (C) outbreaks, the coronavirus behind COVID-19 was (D) network when it launched into an (E) unprepared world at the end of 2019.