How must a 3-year-old child travel in the rear seats of the vehicle?

A)If they do not exceed 135 centimetres they must use an approved restraint system.Correct
B)If they are 135 centimetres tall they may use either an approved restraint system or the adult seat belt.
C)They may use the adult seat belt if the vehicle has them.
Minors whose height is equal to or less than 1.35 m must ride in the rear seats of the vehicle, always using a child restraint device approved according to their height and weight.
There are three exceptions under which minors who do not reach that height may travel in the front seat:
1. When the vehicle has no rear seats.
2. When all the rear seats are already occupied by minors in the same physical conditions and, therefore, it is not feasible to install all the seats required at that moment.
3. When child restraint systems cannot be installed in those seats.
When the height of minors exceeds 1.35 m, they may occupy the front seat using the adult seat belt.
There are three exceptions under which minors who do not reach that height may travel in the front seat:
1. When the vehicle has no rear seats.
2. When all the rear seats are already occupied by minors in the same physical conditions and, therefore, it is not feasible to install all the seats required at that moment.
3. When child restraint systems cannot be installed in those seats.
When the height of minors exceeds 1.35 m, they may occupy the front seat using the adult seat belt.