please help im lost!

A marketing research firm wishes to determine if the residents of Caldwell, Idaho, would be interested in a new downtown restaurant. The firm selects a simple random sample of 185 phone numbers from the Caldwell phone book and calls each household. Only 64 of those called are willing to participate in the survey, and 45 participants would support a new downtown restaurant. (a) The population of interest is A. the 185 phone numbers chosen B. all households in the Caldwell phone book. C. all residents of Caldwell. OD. the 64 households that participated in the study. OE. None of the above. (b) The sample in this survey is A. the 64 households that participated in the study. B. the 185 phone numbers chosen. C. all residents of Caldwell. D. all households in the Caldwell phone book. OE. None of the above. (c) The chance that all 185 phone numbers chosen are located in one particular neighborhood in Caldwell is A. reasonably large due to the "cluster" effect. B. the same as for any other set of 185 phone numbers. C. exactly o. Simple random sampling will spread out the locations of the phone numbers selected. D. 185 divided by the size of the population of Caldwell. E. None of the above