Each Month, the Census Bureau Mails Survey Forms to 250,000

Multiple Choice

Each month, the census bureau mails survey forms to 250,000 households asking questions about the people living in the household and about such things as motor vehicles and housing costs. Telephone calls are made to households that don't return the form. In one month, responses were obtained from 240,000 of the households contacted. A household that does not return the form and cannot be contacted by telephone is an example of:

A) simple random sampling.
B) undercoverage.
C) nonresponse.
D) volunteer bias.