Question

"New States may be admitted by the Congress into this Union; but no new State shall be formed or erected within the Jurisdiction of any other State; nor any State be formed by the Junction of two or more States, or Parts of States, without the Consent of the Legislatures of the States concerned as well as of the Congress."—U.S. Constitution

Based on this quote, the power to create new U.S. states is a
a. concurrent power. powers shared by the national, state, and/or local governments
b. delegated power. powers granted to the national government,
c. reserved power. powers of the state governments not given to the national government nor denied to the states
d. shared power.

Answer 1

Hello!

How can we read,
c. not given to the national government and are retained for state governments

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Answer 2

A. Concurrent power. powers shared by the national, state, and/or local governments

Step-by-step explanation:

The power to create new U.S. states is a concurrent power because in such matter both the Legislatures of the States (which refers to legislative branches of each of the fifty state governments of the U.S.) and Congress (the national or central government) have the duty to cooperate and make a decision about the characteristics of this new states, the conditions in which it will enter, among others, that is to say, they can not enforce this power separately, without the consent of the other.