Who is required to undergo breathalyzer tests?
A)Only drivers who show symptoms of intoxication.
B)Only vehicle drivers.
C)All vehicle drivers and any user directly involved as a possible responsible party in a traffic accident.Correct
# Explanation: Breathalyzer Tests
**All vehicle drivers and users directly involved in an accident** are required to undergo breathalyzer tests. This does not depend on whether they show symptoms of intoxication, but is a mandatory procedure in the event of a traffic accident to determine responsibilities. The law establishes this obligation as a road safety measure, regardless of whether the driver appears to be under the influence of alcohol.