In the following questions, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.

Literature is a __(1)___ through which a person conveys his ideas towards or protest __(2)___ different norms of society. The words that deal with a __(3)___ issue are of particular importance in literature. They are __(4)___ with a particular purpose in __(5)___.