With Respect to Data Collection,which Is True

With respect to data collection,which is true?

A) Compared with in-person survey respondents, Web survey respondents tend to yield higher-quality data.
B) A question such as, "Do you believe the death penalty should be legal," generally should be located near the end of a survey.
C) Collecting demographic information is not useful.
D) The more demographic information collected, the higher the quality of data attained.