This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to shampoo car interior
Clear out any debris.
Any wrappers, papers, stones, or other noticeable pieces of junk that have cluttered up your car interior until now must be cleared away before you can begin shampooing.
Vacuum the car interior.

Choose your answer from:
[a]. If you've made a mess, you can remove the debris with a vacuum nozzle so that the interior stays dry. You should also suck up or rub any stuck-on dirt.
[b]. Vacuuming removes the majority of large dirt particles, making the process of shampooing both easier and more effective. Shampooing should be used primarily to get rid of greasy, smelly gunk that ordinary vacuuming or sweeping cannot remove.
[c]. Ensure all exterior surfaces and new knobs are installed, including the bottoms, frames, and seats. This will allow you to clean the underside and tighten any lines from the past that could become knots and grooves.
[d]. As with baking soda, you want to vacuum every nook and cranny of your car including the floor, under seats, radiator, and floor if you plan to wash your car. Remove small crevices in the interior of the interior of the car.
The answer is:
[b].