Question: Identify the potential source of bias. Using random digit dialing, 1599 people were called and asked what obstacles ( such as childcare) kept them from

Identify the potential source of bias.

Using random digit dialing, 1599 people were called and asked what obstacles ( such as childcare) kept them from exercising

A not asking enough people

B using the word "obstacles"

C no source of bias

D Maybe they don't have children

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