Answer:
B. Businesses should operate ethically to ensure the welfare of their workers.
Step-by-step explanation:
President Roosevelt means to support fair treatmeant of workers at large business with this speech; he uses his famous phrase "square deal", referring to a fair bargain. Just as well, workers who would benefit for this new deal must offer equal signs of respect to the companies that prove to treat them well - according to the last sentences of the paragraph.