In March 2011, the Pew Research Center conducted a survey of US adults to determine whether higher education provides students with a good value compared to the cost. Pollsters randomly selected 2,142 adults ages 18 and older living in the continental US. A total of 1,052 interviews were completed with respondents contacted by landline telephone and 1,090 with those contacted on their cellular phone. Which feature of the sampling plan makes the sample representative of the population?

Group of answer choices

The reputable organization conducting the study (the Pew Research Center)

The large sample size of 2,142 adults

The random selection of adults