This is the best answer. A problem is introduced in P1 (the problem of how to handle privacy of electronic mail). Specific examples illustrating the problem are discussed in P2 and P3, which raise questions about how to handle electronic mail privacy in the government and private sector. P4 presents a possible solution (encryption) but also its shortcomings (makes electronic mail less convenient).

After introducing the problem in P1, the next paragraphs don’t discuss two possible solutions. Rather, they give examples of the problem of electronic mail privacy. In addition, the author doesn’t argue for one solution over another.

After introducing the problem in P1, the author doesn’t analyze the history that helped bring about the problem of electronic mail privacy. We don’t learn about mail before electronics, the development of electronic mail over time, or anything else about the historical circumstances.

The easiest way to eliminate this is to recognize that the author doesn’t argue for one solution at the end. Although the author raises encryption as a potential solution, she doesn’t advocate for its use. Rather, she notes a significant drawback of it (less convenience).

We might see P2 as describing “two contrasting approaches” to privacy of electronic mail in the context of the government. But the author doesn’t argue that the second approach (opponents of deletion of government email) is better than the first (supporters of allowing deletion).