Answer:
Are people in the frame different from the population and are people in the population not on the frames's list ( B )
Explanation:
The two factors that are to be considered : are people in the frame different from the population and are people in the population not on the frames's list. this is because sample frame errors are caused by the presence of respondents who do not qualify for a survey, responding to a survey been carried out and this action will cause an imperfect representation of the population that the survey was intended for.