Final answer:
The phrase 'gave us the green light' means that the boss approved the marketing campaign. It's an idiom that indicates permission or approval to proceed.
Step-by-step explanation:
The phrase 'gave us the green light' is an idiomatic expression that means to approve or give permission to proceed with something. In the context of the question, the correct answer is: B) The boss approved the marketing campaign. This means that the boss has given permission or approval for the team to start working on the new marketing campaign. It is not related to any preference for colors or a dislike of marketing.