Governing marriage laws and conducting elections involve which of the following powers listed below

Given the fact that the Reserved Powers lie within the constituent states, the specific Marriage Laws the and the Conduction of Elections are decisions taken by each state in different ways. Due to the Reserved Powers each state has the autonomy to govern itself in such matters.

In other words, Reserved powers, residual powers, or residuary powers are the powers which are neither prohibited nor openly given by law to any organ of government. Such powers, as well as general power of competence, are given because it is not practical to detail in legislation every act allowed to be carried out by the state.

So the final answer is: Reserved Powers

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.