· A company has four candidates: A. B, W, and D. In order to form the best negotiation lineup, the company has the following arrangements: If A is sent and B is not sent, then C He Dingzhong must send at least one person. If the company didn't send one, the most supportive of this conclusion is:. ['Send B, not C and D.', 'Do not send B, D and C.', 'B, C and D were not sent.', 'B, C, Ding are sent.']