Suzanne and Paul Obtained a Complete List of All 500

Suzanne and Paul obtained a complete list of all 500 students in their marriage and family class. Starting with the first student on the list, each student was assigned a number ranging from 1 to 500. Then, Paul and Suzanne selected for their study every 10^th number on the list. Clearly, they were trying to ensure that their research

A) could have a generalizable conclusion to the U.S. population.
B) had a representative sample.
C) was free of human error.
D) was longitudinal.