Vinci Is Conducting a Study Comparing Conflict Strategies in Newlyweds

Vinci is conducting a study comparing conflict strategies in newlyweds and couples who have been married for 20 years. She has chosen to use laboratory-based observation. A disadvantage of this choice is that:

A) because there are fewer distractions in the lab, couples in her study might use more negative conflict strategies than they would have if she had observed them in their homes.
B) because the lab is an unusual setting, couples in her study might restrain their negative conflict strategies, leading Vinci to underestimate the amount of negativity that goes on in their relationships.
C) laboratory-based observation is very intrusive because it disrupts a couple's standard routines and habits.
D) her observations will have low reliability because the couples in her study will behave differently than they would have if she had observed them in their homes.