Why does Taiwan have to enter athletes into the Olympic games under the title "Chinese Taipei"?

Taiwan competes in the Olympics as “Chinese Taipei” under an arrangement made amid political disputes over its status and the People’s Republic of China’s objections to Taiwan competing under its own name. Not all countries formally recognize Taiwan as a sovereign nation, which makes D, “because not all countries recognize it as a sovereign nation,” the best answer. The other choices do not explain the Olympic naming arrangement.

AI-written and checked against the verified answer.