Read this passage from a 1933 speech by U.S. President Franklin D. Roosevelt:

"Happiness lies not in the mere possession of money; it lies in the joy of achievement, in the thrill of creative effort. The joy and moral stimulation of work no longer must be forgotten in the mad chase of [short-term] profits. These dark days will be worth all they cost us if they teach us that our true destiny is not to be ministered unto but to minister to ourselves and to our fellow men."
— Franklin D. Roosevelt, Inaugural Address, 1933

Which statement best describes how a historian would use a transcript of this speech?

A. As a primary source on Roosevelt's political views
B. As an unfairly biased critique of Roosevelt's presidency
C. As a secondary source summarizing Roosevelt's importance
D. As a narrative source that artistically explains Roosevelt's speech