What was not an achievement of Theodore Roosevelt's administration?

a. Building the Panama Canal

b. Emphasizing conservation

c. Establishing several national parks

d. Introducing the legislation for social security

D. Introducing the legislation for social security

The correct answer is D, as introducing the legislation for social security was not an achievement of Theodore's Roosevelt administration.

The social reforms in the United States were not legislated during his term, which took place between 1901 and 1909, but during the presidency of Franklin D. Roosevelt (1933-1945), within the framework of the New Deal policies.