The correct answer should be C. parthenon
Parthenon is the famous building that everyone sees on post cards and pictures. It is however located inside the Acropolis. The acropolis is a compound of ancient buildings, and the question asks for only one, so that's why it's the Parthenon.
Carelessly/ careless / carelessness
Answer:
Once there was a little boy, With curly hair and pleasant eye— A boy who always told the truth, And never, never told a lie. And when he trotted off to school, The children all about would cry, “There goes the curly-headed boy— The boy that never tells a lie.”