The core concept tested here is the understanding of synonyms. 'Advocate' means to support or recommend something publicly. Therefore, the correct answer is B. Support. The other options are antonyms or unrelated to the meaning of 'advocate'. A. Oppose means to be against something, C. Ignore means to pay no attention to, and D. Reject means to refuse to accept, all of which do not align with the meaning of 'advocate'.