All the residents of a building were polled about whom they would vote for in the upcoming city election for comptroller. What are the sample and the population in this poll?
A The population is the residents of the building the sample is the registered voters in the city.
B The population is the registered voters in the city, the sample is the residents of the building.
C The population is the residents of the building the sample is the residents who responded.
D The population is the registered voters in the city, the sample is a random sample of the residents of the building,