The correct answer is C. The guiding principle of Roosevelt's Square Deal was that Roosevelt would make sure Americans received additional federal services.
The Square Deal was a program of President Theodore Roosevelt aimed at his internal policy and based on some principles of aid to the middle class while the causes of discontent of the working class were suppressed (and thus weakened the nascent unions). The Square Deal maintained some basic ideas: conservation of natural resources, control of large companies and consumer protection.
Roosevelt's program did not imply a radical transformation of the American economy, but rather aimed at very specific and localized objectives, but which Roosevelt considered as decisive elements of influence over the welfare of the Americans. After Roosevelt was elected president in 1904, he began to implement these ideas, proposing competition rules and pushing for them to be eventually approved by the House of Representatives and the Senate.
Thanks to these new regulations, the federal government sponsored legal proceedings against almost 44 large companies that violated competition laws in one way or another, from food companies to railroads. The political influence of Roosevelt motivated that the courts, until then guided by a jurisprudence favorable to the companies, should create new jurisprudence according to the competition legislation.
Another part of the Square Deal was the elaboration of consumer protection standards that regulated the sale of meats for retail consumers, setting health parameters for packaging, cutting, preserving and selling meat products. Also with the aim of preserving the health of consumers, regulations that ordered the correct designation and labeling of medicines and packaged foods were issued.