Which of the Following Illustrates a Grouped Data Frequency Distribution

Which of the following illustrates a grouped data frequency distribution?

A) Thirty-six students are enrolled in introductory statistics, section A.
B) Five new students have been accepted on the editorial staff of their school paper.Two of the students are 18 years of age, one is 19 years, and two are 21 years of age.
C) Of the 20 female students living in a housing complex, 10 are under 20 years of age, one is between 20 and 25 years, seven are between 26 and 30 years, and two are above 30 years.
D) all of these.