Which of the Following Is a Reason on as to Why

Multiple Choice

Which of the following is a reason on as to why non-compliance can be a problem?

A) Non-compliance can lead to a correlation between treatment delivered and the error term.
B) Non-compliance can lead to a correlation between treatment and other independent variables.
C) Even completely random causes biased estimates of the treatment effects.
D) Non-compliance is not a problem if compliance is not random.