The participant's changed their answers to conform to the group standard
Every individuals have the inner fear of being outcasted by the other members of a social group.
To avoid this, most people develop the tendency to conform to a group's opinion even if they personally believed in different things.
One of the most known studies that first introduced this tendency to the world is called Asch conformity experiments
The answer to your question is B. corruption
Corruption is dishonesty by one used for personal reasons.
A. roller coaster,"<span>an undulating wave that travels over the surface of a solid, especially of the ground in an earthquake, with a speed independent of wavelength."</span>
They banned Japanese from owning any land. So if they owned any land, they were then forced to sell it.