Option B and C
Federalism is a system of government whereby there is a controlling Authority over a system of government where by the possibility of a principles of a party is implemented generally.
It encourages economic equality and it has a sharing formulae that would benefit the whole system and it encourages different opinion so dar it would contribute to the development of the system . it doesn't encourages much political participation as it is not the reason why people engage in political activities and also it doesn't provide for multiple system of government. So options B and C are exemptions