The correct answer is D. an object of public notice.
A politician is someone who is involved in politics, which is the art or science of government. Politicians are often in the public eye, as they are responsible for making decisions that affect the lives of many people. As a result, they are often the subject of public attention and scrutiny.
Option A is incorrect because giving speeches is not the only thing that politicians do. They also spend time meeting with constituents, working on legislation, and campaigning for office.
Option B is incorrect because politicians are not always admired. In fact, they are often criticized for their decisions and actions.
Option C is incorrect because politicians are not always the center of attention. They may be overshadowed by other public figures, such as celebrities or athletes.
Therefore, the correct answer is D. an object of public notice.