Q.) A writer must be aware of connotation

a. as opposed to denotation, which has no literary use

b. and its use in propaganda and other unpleasant things

c. in order to make the reader have an emotional reaction

d. because connotation so frequently bores or annoys readers

The correct answer should be c. in order to make the reader have an emotional reaction

Denotation has literary use so it's not a, while propaganda and unpleasant things are not necessary aspects of a written piece. Connotation doesn't often bore and annoy the reader and is considered to be rather enjoyable.