Answer: D
Explanation:
Because the magazine is asking the reader to return the survey, the reader doesn't have to there just doing it with their free will
A survey that asks readers to return the survey would result in :
( D ) Voluntary-response bias
When the response of a survey by a reader is not influenced by the author or the questioner of the survey the response sent by the reader is going to be a voluntary response.
In a voluntary response the response is void of external influence therefore the reader gives his/her honest opinion without external/Questioner's bias
Hence we can conclude that a survey that asks readers to return the survey would result in voluntary response bias.
learn more about voluntary response bias : https://brainly.com/question/26430204