In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Q: [header] How to sell an advertising idea [title] Build up a credible track record. [step] You will achieve the most success with your advertising ideas if you have already established your ability to think strategically and execute creative ideas. When clients or agencies are judging ideas, they are also gauging you. <sep> (A) Your reputation will improve if you showcase your leadership skills and excellent manner of communicating with clients and others in the industry. Creating a professional standing can help ensure that you stand out and get to know customers personally. (B) This leads to your ability to craft strong marketing ideas. [substeps] Look at your price and output sheet. (C) [title] Establish a partnership with a credible person, if you have not yet established your track record. [step] Find someone senior to you who is willing to hear your pitch and give you some credit. (D) [substeps] Build your track record first so clients can compare your ideas to theirs. If you tell your clients, for example, to see your work, you first need to build up a written record.
A:
C