You want to conduct a survey in your neighborhood on people's opinions about the performance of the U.S. Congress this year. There are 100 households in your neighborhood, but you are only able to visit four of them this evening. Which of the following is not a valid random sample?
A. {no opinion, satisfied, unsatisfied, no opinion}
B. {tasty, bitter, neutral, bitter}
C. {unsure, poor, good, poor}
D. {fantastic, terrible, neutral, fantastic}

Question

You want to conduct a survey in your neighborhood on people's opinions about the performance of the U.S. Congress this year. There are 100 households in your neighborhood, but you are only able to visit four of them this evening. Which of the following is not a valid random sample?
	A.	{no opinion, satisfied, unsatisfied, no opinion}
	B.	{tasty, bitter, neutral, bitter}
	C.	{unsure, poor, good, poor}
	D.	{fantastic, terrible, neutral, fantastic}