Text: Quota sampling assumes that the answers of a particular demographic group such as white, 18-to-25-year-old Internet users can be projected to describe the opinions of white 18-to-25-year-olds at large.
Entailment: Quota sampling means that you obtain enough answers so that you have a representative picture of a wider demographic.
Contradiction: Quota sampling is where you blanket poll the entire population and ignore demographics.