问题详情

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.

请帮忙给出正确答案和分析，谢谢！