Answer:
B). While tablets are expensive, most buyers can save money in the long run by purchasing e-textbooks instead of print books.
D). However, the amount of money districts spend on paper used for copies, which tablets would largely replace, balances the implementation cost.
Step-by-step explanation:
Counterclaims are demonstrated as the claim that primarily intends to rebut or defy the previous claim made by the author. It assists the author to present a fair representation of the topic by including both the sides of the issue. However, the authors are required to rebut these counterclaims through sufficient relevant evidences to establish the validity of the central claim.
In the given question, options B and D offer a fair and logical rebuttal to the counterclaim. In option B, the author invalidates the claim by stating factual probability 'most buyers can save money....print books' and in option D, the author refutes the idea of 'print books' by involving the facts associated with the implementation cost incurred for it and logically proves his claim(use of tablets). Thus, options B and D are correct answers.