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A newspaper designs a survey to estimate the proportion of a city's residents who favor a proposal to hire 100 additional policemen. It takes a sample of its 1000 most recent subscribers, and sends them a questionnaire that asks, "Is it a good idea to hire 100 additional policemen, which will lower the crime rate lower the crime rate and make this city safer ?" After analyzing results from the 6464 people who reply, they report that 68% of the residents favor the proposal.

A. Identify the bias that results from?

(a) Sampling bias due to undercoverage.
(b) Sampling bias due to the sampling design.
(c) Nonresponse bias,
(d) Response bias due to the way the question was asked.