If a Marketing Researcher Is Trying to Determine Whether or Not

If a marketing researcher is trying to determine whether or not individuals living in Boston prefer domestic or imported beer, which technique would MOST likely yield a random sample?

A) randomly surveying individuals who are drinking beer in Boston bars
B) randomly surveying individuals who are purchasing beer in Boston liquor stores
C) mailing surveys to Boston residents over the age of 20 who were randomly selected from voter registration data
D) mailing surveys to Boston residents over the age of 20 who were randomly selected from birth certificate data