The correct answer is A, "Last week, you recommended spending the budget surplus on new textbooks."
Since the opposition believes that the money should be spent on textbooks instead of computers, Karen would show that she is knowledgeable about the different perspectives by stating the perspective of her opposition. This makes it clear that she knows exactly what the opposition wants. If she stated that there were simply other important things they could spend the money on it would not mean she knew what the opposition might want to spend that money on. It would simply mean she knew there were other options.