Read this line from a speech delivered by a corporate CEO to his company's employees. President Calvin Coolidge knew that "the business of America is business." In other words, what benefits a company like ours benefits everybody. How valid is this text as a source of credible evidence, and why? A) It is highly valid, because the speaker has a strong background in business.
B) It is highly valid, because the Great Depression began right after Coolidge left office.
C) Its validity is questionable, because nobody can prove that the Coolidge quote is accurate.
D) Its validity is questionable, since the speaker benefits from people believing it.