Answer:
C. A federal system makes the government serve its citizens better because it allows for the existence of sub-units that have significant power.
Step-by-step explanation:
A normative statement is a kind of statement which offers, the betterment, as includes a suggestion in the statement.
It is not descriptive statement, as it does not include any facts.
A descriptive statement states the facts and analyses the situations accordingly.
This statement is descriptive as rest above statements a and b includes facts.
And the statement d does not provide any suggestion, whereas only statement c provides a suggestion for the system.
Thus, correct option is
Statement c