Final answer:
The best rebuttal to the criticism of the WPA emphasizes the necessity of federal assistance when other public welfare systems fail, justifying New Deal measures as crucial during economic hardships.
Step-by-step explanation:
The strongest rebuttal to the claim that the Works Progress Administration (WPA) discouraged work by offering a weekly income is a quote emphasizing that government assistance was necessary when other levels of public welfare failed. It acknowledges that the economic situation required federal intervention to alleviate widespread unemployment and poverty, thus justifying the New Deal programs, including WPA.
The quote that best serves this rebuttal is, "When the city hasn't got funds to finance Public Welfare ... and then when the state finds the burden's more than they can swing, you'll see how long it takes the old birds in Washington to realize it's government help, or else ..." This quote supports the notion that the New Deal and the WPA were responses to dire economic circumstances and were necessary to prevent an even greater economic collapse.