The idea that is advocated by Roosevelt in the passage is "prohibiting child labor in the District of Columbia," as stated in option C and expressed below.
What is the passage about?
In the passage, Roosevelt advocates that child labor should be prohibited, that is, forbidden in the whole country. However, the focus of the passage is prohibiting it in the District of Columbia, which depends on Congress to make its laws.
In other words, Roosevelt find it unfortunate that the District of Columbia does not have any law or bill concerning the prohibition of child labor. With that in mind, we can choose option C as the correct answer.
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