Directions: 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 sentences grammatically correct?

a. Nothing is more effort(A) to a coach than an aspiring(B) athlete who puts forth little annoying(C).
b. The fateful(D) moment when the king was crowned separate(E) the merging of two signified(F) kingdoms.