With a diesel engine, we will start moving...
A)Immediately after starting the engine.
B)We will wait 10 minutes.
C)We will wait a few seconds.Correct
In modern vehicles, it is not necessary to rev the engine to start it.
With petrol engines, we will start moving immediately after starting the engine, thus avoiding fuel consumption at idle (the minimum rev range the engine needs to keep running while we are not accelerating).
With diesel engines, it is advisable to wait a few seconds before moving off so that lubrication is adequate.