The right answer is A, <em>The Canadian flag is red and white</em>. A proper adjective is the word that provides information about qualities of a proper noun, which is why it is usually capitalized. In this case, "The Canadian flag" is the right answer because it is derived from the proper noun <em>Canada</em>.
Martin Luther broke from the Catholic Church after nailing his 95 theses to a church door in 1517. He restudied the Bible and realized that many of the Catholic church's policies and ideas had no Biblical background. The long-term impact is known today as Protestantism.