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In an October 2012 survey of 7,786 randomly selected adults living in Germany, 5,840 said they exercised for at least 30 minutes three or more times per week. Identify, with the proper notation, the quantity being estimated. Al x - the mean number of German adults in the survey who exercise for 30 minutes three or more times per week. B)p - the proportion of German adults in the survey who exercise for 30 minutes three or more times per week. C) = the mean number of German adults who exercise for 30 minutes three or more times per week. D) p - proportion of German adults who exercise for 30 minutes three or more times per week. OA OC OB OD