Which of the statements below contain a parameter? There is only one correct answer
A. a survey is given to a group of randomly selected college students and it showed that more than 80% of them drink at least one cup of coffee per day.
B. The average height of a group of first graders is 32 inches.
C. The average age of all the employees in a software company is 34 years.
D. In a recent opinion poll, 65% of the respondents said that they have not traveled to an overseas country.