The scaffolding was called centering
Basically, it was a wooden construction that was used as an imitation of the arch and and would hold it until it was built and strengthened after which it was removed. The centering was a key component since it would not be able to build it so perfectly or at all if it weren't for the centering. Such centering is not used anymore due to other contemporary technology.
The answer is going to be B.
Ugly American<span>" is a pejorative term used to </span>refer<span> to perceptions of loud, arrogant, demeaning, thoughtless, ignorant, and ethnocentric behavior of </span>American<span> citizens mainly abroad, but also at home. Although the term is usually associated with or applied to </span>travelers<span> and </span>tourists<span>, it also applies to U.S. corporate businesses </span>