The writer intends the passage to be read by a general audience. Which of the following sentences, if added after sentence 14 (reproduced below), would best aid a reader’s understanding of the passage?

Internet slang or "text-talk” has become popular in short, electronic written messages, but in recent years this language has made its way into formal writing and become an impediment to basic language functions.

The use of “text-talk” increases the rate of response across all forms of electronic communication by making it easier and more efficient for the recipient to respond.
Individuals who frequently use “text-talk” in their written documents often struggle to build and apply an expansive vocabulary for use in more formal settings.
While acceptable in personal messages, constant use of abbreviations and informal language disrupts an individual’s application of acceptable formal language in academic and professional documents.
A recent school board report shows a plateau in middle school test results designed to assess students’ mastery of spelling, grammar, and written mechanics.
In addition, the predictive text function on most cellular devices only exacerbates this concern by suggesting acronyms or slang to replace certain words or phrases.