Constitutionalism is a political theory

a. characterized by an absence of government and absolute freedom of the individual.

b. calling for government according to fundamental laws and principles.

c. calling on an authoritarian ruler to make all key governmental decisions.

d. not actually practiced in any nation of the world today.

B. Calling for government according to fundamental laws and principles.

Explanation:

Constitutionalism is a political theory that is associated with philosophers like John Locke. This kind of political theory limits the government and puts some sort of legal restrictions on its powers. In such a case, the legitimacy of the government is dependent on its observation of these limitations. This sort of a government is believed to be unbiased and ideal for running a state which gives utmost importance to equality and justice and welfare of the people.