The correct answer is d. building onto and expanding them.
The New Deal was an interventionist policy implemented by American President Franklin D. Roosevelt in order to face the effects of the great depression in the United States. This program was developed between 1933 and 1938 with the goal of supporting the lower levels of the population, to reform the financial markets, and to improve the American economy that was damaged since 1929 crack due to a severe unemployment rate and bankruptcy.
For its objectives and the way it was implemented, the New Deal was a very liberal policy and President Roosevelt was supported by the majority of liberal leaders across the country. Therefore, liberal leaders wanted to build onto and expand these policies in order to fight poverty, to extend social and economic rights, to improve the quality of life of millions of workers, and to build up a welfare state system.