The <em>thing </em>which must occur <em>before a treaty can go into effect fully</em>, according to the provisions of the United States Constitution is:
- A. It must be approved by a two-thirds vote in the Senate.
According to the given question, we are asked to state the <em>thing </em>which must occur <em>before a treaty can go into effect fully</em>, according to the provisions of the United States Constitution
As a result of this, we can see that a treaty is an agreement which is signed between two parties and <em>in this context</em>, it would need the involvement of another country, where<em> conditions would have to be met</em> before the treaty goes into effect and the president needs at least two third majority vote from the Senate.
Therefore, the correct answer is option A
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