Answer:
The concession that will demonstrate that Karen is a reasonable person who values and acknowledges the opposing view is "I agree that textbooks are important and useful."
Step-by-step explanation:
This concession acknowledges the opposing viewpoint that the budget surplus should be spent on textbooks. By agreeing that textbooks are important and useful, Karen demonstrates that she values the opposing view and is willing to consider it. This concession shows that Karen is a reasonable person who is willing to engage in a productive debate and is open to finding a compromise that benefits both sides. It also highlights that Karen is not dismissive of the opposing view, but rather recognizes its value and importance. By acknowledging the value of textbooks, Karen can then go on to argue why upgrading the equipment in the school computer lab is the better choice for the budget surplus.