First #2: “be” a policeman – suggests you can step into that job; whereas, “become” is a process that involves training/preparation. I think “become” is needed. (A) “Whatever bias you hold on the job, it…” The introduction of the word, ‘bias’ is not justified within this paragraph.
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lucas21cas you might have got it wrong.You have one too many thoughts in the second half of the "chances" sentence. To keep it positive, I suggest not including these last seven words. They concern the prejudice issue.