In a vehicle with a diesel engine, once the engine has been started it is advisable to...
A)rev the engine in neutral so that it warms up.
B)set off immediately.
C)wait a few seconds before setting off.Correct
In diesel cars, after starting the engine it is advisable to wait a few seconds before setting off, so that the oil reaches the lubrication areas under the right conditions. In contrast, in petrol engines you should set off immediately after starting the engine.