Question ID:PT84 S3 Q25 Passage:Essayist writing in 2012: At its onset, a new medium is limited to carrying content from the old medium it replaces. We are in that phase with e-books‚ today‚ s e-books take their content from print books. Thus it is too early to understand the e-book as a medium, since it has not yet taken its ultimate form. Stem:Which one of the following principles, if valid, most helps to justify the essayist's reasoning? Correct Answer Choice:DChoice A:A medium cannot be fully understood without first understanding the media that came before it. Choice B:No electronic medium can resemble a print medium more than it resembles other electronic media. Choice C:The ultimate form that a medium will take depends on available technology. Choice D:A medium cannot be understood without observing the evolution of its content. Choice E:One medium can replace another only if it can represent richer and more varied content.