It is necessary to change the vehicle's tyres...
A)only if they show uneven wear, cuts, cracks or deformations.
B)only if the tread depth is less than 1.6 millimetres.
C)at least every 5 years, even if they are not worn.Correct
It is advisable to change tyres every 5 years at most, as the rubber hardens over time and loses grip, even if the tread is still good.