What does the term accession refer to?

The term "accession" refers to the act of acknowledging or granting consent, often in a formal context. It is commonly used in legal and political discussions where one party formally agrees to a decision, treaty, or position. The essence of accession lies in the idea of accepting or adopting something, whether it's a right, a claim, or a position.

In this context, the other options do not align with the meaning of "accession." An increase in quantity focuses on numerical growth rather than consent or agreement. Disagreement with authority suggests a conflict or opposition, which is fundamentally different from the idea of granting consent. Lastly, the act of rebellion stands in direct opposition to the notion of accession, which is about acceptance rather than defiance. Therefore, the answer that best captures the essence of "accession" is the one that pertains to acknowledgment or consent.