Multi-choice problem: Continue writing the next sentence in this paragraph:

How to clean bathroom tile 
Use vinegar to clean the tile. 
Mixing water and distilled white (or cleaning) vinegar in equal amounts produces an effective cleaning agent. For instance, you might mix five tablespoons of vinegar with five tablespoons of water.

Pick from: (a). In order to prevent water from being poured into the tile after you've already cleaned it, you might use salt. If the tiles are extremely porous, diy vinegar might be more effective than white vinegar.; (b). Then add two to three drops of a mild dish detergent or bleach into the mixture. Vinegar is not recommended for bathrooms that have good ventilation because it's highly flammable and very dangerous.; (c). If your tiles are stained, you can use white vinegar for best results. However, plain vinegar isn't supposed to clean tiles as well as dry.; (d). Dab a rag in the mixture and scrub the tile until clean. Wipe dry, or allow to air dry.;
(d).