Clause 21.5

Passenger transportation services (up to 8 persons, excluding the driver) in a cargo vehicle adapted for this purpose are permitted for drivers who have more than three years of driving experience and a category "C" driver's license, and in the case of transporting more than the specified number (including passengers in the cab) — categories "C" and "D".

This clause directly establishes the minimum driving experience requirement for a driver with a category "C" license to transport up to 8 passengers (excluding the driver) in an adapted cargo vehicle — more than three years, which in exam answers is presented as "three years".

Thus, the correct answer is "Three years.", considering that according to the definition of the Traffic Rules, transportation of up to 8 passengers in an adapted cargo vehicle is allowed for a category "C" driver only if they have more than three years of driving experience.

When it comes to a cargo vehicle that has been specially adapted for transporting people (for example, seats have been installed in the cargo area), the law treats this as increased driver responsibility. Therefore, not only is the appropriate license category important here, but also sufficient practical driving experience.

Clause 21.5 of the Traffic Rules of Ukraine establishes a requirement specifically for situations where up to 8 passengers (excluding the driver) are transported in an adapted cargo vehicle. For such transportation, the driver must have a category “C” license and more than three years of driving experience with vehicles. This means that a driver with a category “C” license but less experience (for example, 1–2 years) is not permitted to provide such transportation.

The logic of the rule is simple: a cargo vehicle has different dimensions, weight, and handling characteristics, and passengers in the cargo area require more careful actions from the driver. Therefore, the state allows such transportation only for those who have already gained sufficient safe driving experience.

Thus, the correct answer is “Three years,” since for transporting up to 8 passengers in an adapted cargo vehicle with a category “C” license, the Traffic Rules require at least more than three years of driving experience.