Nonresponse Refers To

Nonresponse refers to:

A) the number of questions that are not answered in a survey.
B) the failures by qualified respondents to take part in the survey.
C) the number of people in the population that were not asked to respond.
D) the phone numbers called during plus-one dialing that are not true phone numbers.
E) the percent of individuals in the sample who do not qualify to take the survey.