If You Tried to Phone Someone Who Was Selected to Participate

Multiple Choice

If you tried to phone someone who was selected to participate in a telephone survey, and you couldn't reach that person the first time, what should you do?

A) Give up and select another person at random to take their place in the sample.
B) Keep that person in the sample, and keep trying to get a hold of them.
C) Remove that person from the sample and don't replace them.
D) Call your neighbor and ask them to participate in the survey instead - at least you know they're home.