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

a. Though unified(A) in their support of(B) new leader, the country’s hardline factions(C) did not succeed in fathom(D) the disaffected public.

b. The themes display(E) a newer energising(F) than the technical modernism(G) of the composer’s earlier(H) works.