Answer:
Option D
Step-by-step explanation:
A social Unit consist of 2 or more people coming together, such unit could be group of individuals, family and friends coming together to form a social unit.
When there is a advancement/progress with the social unit, in form of moving from one level to another is called a social process.
Jennifer and Tyrone are individuals coming together and agreeing to date, this forms a social unit. Now they both agree to moving together to stay in the same dorm is an example of a change or progress with the unit, this is called social progress, it is a result of both of them agreeing together that brought the change.
So therefore option D is the best answer.