Which meaning of annex is used to mean 'to add or attach'?

• A. To take control or possession over a piece of land without permission and often by the use of force.
• B. To detach or remove from something.
• C. To join with or connect to something.
• D. To add or attach.

Answer: (D)

This term has multiple senses, and the one meant by “to add or attach” is the sense of appending something to an existing thing. Think of extending a building or adding an appendix to a report—that’s about attaching or adding an extra part to the whole. This usage focuses on making the original item larger or more complete by incorporating an additional piece. In contrast, other senses exist, like territorial annexation (taking land by force) or simply joining or connecting something without implying an addition, or even detaching something, which aren’t about adding. So the sense that fits “to add or attach” is the one that describes appending or attaching an extra part to the current object.