Aminor who misrepresents his or her age to purchase alcohol commits the offense of
a. intoxication assault
b. minor in possession
c. driving under the influence
d. public intoxication

The answer to this question is Minor in Possession
In most cases, this type of violation is being done by forging out an ID.
For minors, the amount of punishment usually is not considered big/fatal. Usually only a small amount of fines, driving license being suspended, and some required days in doing community services.

1. a lack of knowledge