When starting the engine you should release the key or start button:

• A. As soon as the engine starts
• B. After the engine starts to idle
• C. When the dash lights go out
• D. Immediately after the engine starts

Answer: (D)

When you start the engine, the starter motor is meant to run only for a moment to crank the engine. You should release the key or start button immediately after the engine fires and begins running. This lets the ignition switch move out of the start position and the engine take over, while the starter disengages automatically. Holding the key in the start position can keep the starter energized, which risks overheating the starter, draining the battery, or causing electrical wear.

The other cues aren’t reliable signals for the handoff. Waiting until the engine has reached idle means you’ve kept the starter engaged longer than necessary, and using dash lights going out isn’t a consistent trigger. So the correct action is to release right after the engine starts to run.