What do constitutions typically do for a government?
a. they tell where the national and state capital must be
b. they identify from which states federal government leaders will come
c. they explain its structure and powers usually in written form
d. they create unchanging laws for all citizens

C.they explain its structure and powers usually in written form

Explanation:

A Constitution is a coded text of a juridical-political nature, the result of a constituent power, which has the purpose of constituting the separation of powers, defining and creating the constituted powers (legislative, executive and judicial), which before the constitution were united or intermingled, it defines its respective checks and balances, it is also the fundamental law of a State, with superior rank to the rest of legal norms, basing (according to normativism) all the juridical order, it includes the regime of the rights and liberties of citizens and defines the powers and institutions of political organization.

"this speech"? what speech are you talking about?