In the following question, two statements are given with some words in bold. Which of the following pairs of bold words must be interchanged to make both the sentences grammatically correct.

a. Anti-Semitism had been a (A)force in European (B)politics, especially in eastern Europe, since the (C)tenets of the Christian (D)era.

b. In recent years, nonliberal feminists have increasingly (E)dismissed liberal feminists claiming that the main (F)dawn of liberal feminist thought do not necessarily (G)advance all women's (H)interests.