Normative statements are the statements that include value that is used for describing desirability and undesirability of situation.It is based on further requirements, need and perspective.
According to the question, statement that provide description about world should be is a normative statement as it describes the possible requirements for world .
Other options are incorrect because descriptive statement is based on objective and facts. Economist hired by government or in scientific field is not described through world description. Thus, the correct option is option(a).
