After reading the text and identifying the sentences that support the author thesis, we can say they are the following:
"The WPA, which existed until 1943, provided work and a paycheck to almost 9 million Americans."
"At a time when people had lost much - if not all - of the money for which they had worked, The Social Security Act guaranteed pensions to millions of Americans.
Supporting the thesis
The author's thesis in the text is that President Roosevelt was very effective in helping people throughout the Great Depression through a series of programs.
Sentences that support that thesis will show how the programs functioned, how they helped people. That is why the sentences that mention the WPA and the Social Security Act should be selected. They explain what the two programs did and how people were helped through them.
Learn more about supporting the thesis here:
https://brainly.com/question/540693
