rschunti
As is often the case on more difficult sentence correction questions, consideration of both grammatical errors and clarity of meaning is beneficial on this question.
Answer choices B, C, and D incorrectly use the word "as" in conjunction with the "either X or Y" construction: C and D add an unnecessary second "as," while B requires an "as" after "or".
The differences between A and E concern both concision and clarity of meaning. Choice E seems to indicate that the purchase of these purely digital works and the sale of them are two unconnected actions, while A correctly indicates that these "purely digital" works are "to be sold online" (since the works are purely digital). Additionally, the "it will sell them" construction in E is unnecessarily wordy and awkward.
Thus, A is the best response.
-dan
The largest trade-book publisher in the US has announced the creation of a new digital imprint division, under which it will publish about 20 purely digital works to be sold online as either electronic books or downloadable copies that can be printed upon purchase.
A) works to be sold online as either electronic books or
B) works to sell them online, either as electronic books or
C) works and it will sell them online as either electronic books or as
D) works, and selling them online as either electronic books or as
E) works, and it will sell them online as either electronic books or