Answer:T
he answer is C
Let's go through the options:
a. declare sovereignty in a document, such as the Declaration of Independence
-this is a good start, but it's not enough, a number of states have declared sovereignty but they were not recognized internationally.
b. pass a law requiring other states to recognize its sovereignty
- a state can't pass a law about what the others should do: this is a false answer
c. gain recognition of sovereignty from the United Nations
-this is the best way of achieving sovereignty in a way that is recognized internationally - this is the best answer.
d. merge with another state and form a new state
-this is not the right answer - this state would not be sovereign then.
Explanation: