Answer:
B). 'You do an excellent job refuting your opponent's claims and providing reasons why they are not valid."
Step-by-step explanation:
'Big-picture' feedback, as the title itself, suggests that 'an overall and broad assessment of a situation, activity, or its results.' The second option exemplifies the big-picture feedback as it focuses on the entire content of the work while the other options merely concern a specific element(introduction, writing style, or proofreading). It reveals the entire perspective on the work that 'how the counterclaims have been intelligibly refuted through logic and reason' that offers a clear and comprehensive evaluation of the work. Thus, option B is the correct answer.