Which fact most effectively supports the claim that PGP can be used by an ordinary person?

PGP works efficiently on a personal computer.

Explanation:

Since PGP can work efficiently on a personal computer with just the push of a button, it makes it very easy to use by an ordinary person. That ordinary person may not understand the mathematics or the digital encryption so these are not good options. The article talks about how the ordinary person can put PGP on their personal computer and it will automatically incorporate a digital signature and encrypt an email with the touch of a button. This way anyone can use it.

the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.  

you need to write a question based on a prompt. you have not given the prompt, and therefore this question cannot be answered on unless you provide it.