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OFFICIAL EXPLANATION


After we've read through the whole sentence, we might notice that our answer choices offer us several ways to begin the marked phrase. The overall sentence is a little long, but rereading it carefully, we see that the two book titles are connected by the phrase "both...and...," so the addition of "also" or "of" is unnecessary and possibly confusing. Eliminating choices that add those words, we are left only with choice (E). This choice also replaces the redundant phrase "expert specialist" with the simpler "expert."


The correct answer is Choice (E).
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