Which of the following best describes the relation of paragraph 2 to paragraph 1？A．Paragra
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Which of the following best describes the relation of paragraph 2 to paragraph 1？
A．Paragraph 2 shows how the problem discussed in paragraph 1 arose.
B．Paragraph 2 explains how the problem presented in paragraph 1 came to be solved.
C．Paragraph 2 provides a more technical discussion of the problem introduced in paragraph 1.
D．Paragraph 2 shows why the problem discussed in paragraph 1 was especially important to solve.
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