Professor Herchak Is Researching the Study Habits of Students at the College

Multiple Choice

Professor Herchak is researching the study habits of students at the college where he teaches. Which of the following is an example of a convenience sample?

A) Half the students registered at the college
B) All the students in his two sections of Introduction to Sociology
C) Thirty students randomly selected from the registrar's list of all students
D) Only the full-time students at the college.