riddle for u guys since im bored / I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I? / brainliest if right

The main reason that you should secure loose objects in your car before you drive is that a. objects too close to the engine may be affected by the heat b. they are likely to get damaged moving around your car c. they may be thrown into a spot that disrupts your driving d. they will be more easily retrieved from a single storage location