Answer:
B). Paragraph 3.
Step-by-step explanation:
Counterarguments function to invalidate the prior claims or arguments proposed in an essay, paper, or text. Thus, they need to be addressed carefully by offering sufficient evidence to substantiate your actual claim or idea which is here about 'the importance of immigration reform'. In the given example, paragraph 3 aptly addresses the counterclaim('Immigrants drain resources from American citizens') by proposing relevant factual evidence that 'immigrants contribute to the U.S. economy' that strengthens the original claim of the author. Thus, option B is the correct answer.