Awriter 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 is option C. A writer must be aware of connotation- in order to make the reader have an emotional reaction. Connotation is the opposite of denotation. Connotation is the secondary meaning of a word evoked from certain feelings or emotions, aside from its literal or dictionary meaning (denotation). 

C,  in order to make the reader have an emotional reaction

answer not know the first one minutes