The manager of a city recreation center wants to estimate the percent of city residents who favor a proposal to build a new dog park. To gather data, the manager will select a random sample of city residents. Which of the following is the most appropriate interval for the manager to use for such an estimate?
A. A one-sample z-interval for a population proportion
B. A one-sample z-interval for a difference between population proportions
C. A two-sample z-interval for a difference between sample proportions
D. A two-sample z-interval for a difference between population proportions