Answer:
1. Which paragraph or paragraphs use the pivoting approach?
Pivoting writing uses the words even though, however, but, in spite off, etc., to pivot back to the main idea of the paragraph. In paragraph B, it starts talking about employee concerns about a bad corporate environment in the new offices (in Los Angeles or Las Vegas), and then it assures that this will not happen. It affirms that the company is taking care of the issue and the corporate environment in LA will be the same as in San Francisco.
2. What is the main idea of Paragraph A?
If informs the reader that the company just closed a merger with Editionplus and that soon profits should increase, new products will developed and the company will grow.