Brazil offers a challenge to the study of comparative politics because of all of the following EXCEPT

a. it has had periods of both centralization and decentralization, both of which have strengthened and weakened the state's capacity.
b. it demonstrates how the lack of coherent party systems and electoral institutions can endanger democracy.
c. even while the country has developed economically, it has become a more socially unequal country.
d. the complex divisions that afflict the country's collective identities challenge attempts to address its problems.
e. despite its transition to democracy, the constant threat of military intervention highlights the fragile nature of its political system.

e