Final answer:
Option (E), The conclusion drawn from the text is that the personal computer has become the primary source of printed communication, replacing the typewriter.
Step-by-step explanation:
From the text 'The Clack of the Past' by Zack Bell, we can infer that the personal computer has replaced the typewriter as the primary source of printed communication. This shift marks a significant change in how written documents are produced, with the PC ushering in a new era of efficiency and capabilities beyond what the typewriter could offer.
The conclusion that the personal computer is now the primary source of printed communication is supported by the text's depiction of the typewriter's displacement over the past several decades.