A city council member wants to know how the people in her city feel about the condition of the city parks. She emails a survey to the home address of all residents who take part in a city recreational sport league. Select the type of bias most likely to affect the results of the survey.

The survey is meant to represent all city residents, but it is sent only to people who participate in a city recreational sport league. Residents outside those leagues have no chance to be included, so the sample leaves out part of the population. This is undercoverage bias, choice D.

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