Help me with this hard math!!!?
Scott took a part time job as a pollster for the Stonebridge Mall. He was assigned to stand at the west entrance of the mall and approach every 100th person coming into the mall to ask a few questions. While counting the people who passed by, he skipped everyone that he knew. Identify the one piece of information that might be a source of bias.
A. He skipped everyone that he knew.
B. He stood at the west entrance of the mall.
C. He only approached people coming into the mall, not those going out.
D. He only asked every 100th person.
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B or C
i think it might be b
B C and D are all part of his assignment.. the answer is A obivously