Answer:
D. Most music groups are made of 3 or more persons
Step-by-step explanation:
It is quite uncommon to find that there are less than three persons in any music group. Although it is possible, the number of groups with less than three persons are quite less than the number of groups that are more.
By implementing this law that there can only be three people or less in the group does not decrease the amount of noise that is made but it does decrease the frequency that the noise is made.
This implementation will see fewer groups and reduced noise overall. However when the noise is made it is very likely that it will be just as loud as a band with more than three persons.