Read Each Textbook Excerpt and Then Answer the Questions That

Read each textbook excerpt and then answer the questions that follow.
The essential difference between cohabitation and marriage is commitment. In marriage, the assumption is permanence; in cohabitation, couples agree to remain together for "as long as it works out." For marriage, individuals make public vows that legally bind them as a couple; for cohabitation, they simply move in together. Marriage requires a judge to authorize its termination, but if a cohabiting relationship sours, the couple separates, telling friends and family that "it didn't work out."
-The organizational pattern used in this excerpt is

A) definition.
B) listing.
C) process.
D) comparison-contrast.