Alarge simple random sample of people aged nineteen to thirty living in the state of colorado was surveyed to determine which of two mp3 players just developed by a new company was preferred. to which of the following populations can the results of this survey be safely generalized

(a) only people aged nineteen to thirty living in the state of colorado who were in this survey
(b) only people aged nineteen to thirty living in the state of colorado
(c) all people living in the state of colorado
(d) only people aged nineteen to thirty living in the united states (e) all people living in the united states