Why does the statue of liberty look the way she does?

The Statue's copper has naturally oxidized to form its familiar "patina" green coating. This patina is as thick, in many places, as the copper behind it and is protecting the copper from naturally wearing away.

C. like a sail without wind or purpose

According to my researches, the statement   "the factual information allows you to judge how credible the analysis in the source is." is not true. a factual information does not judge any credible analysis because it shows facts that are generally known by everyone.