Write the next sentence in the following story.

How to keep your plants from dying
Choose potting soil that is formulated for indoors.
It can be tempting to use dirt from your yard or the same potting soil that you use outside; however, indoor plants have different needs than outdoor plants. Make sure that your soil is made for indoor plants because it will be lightly packed enough for the plants to grow while still tight enough to hold in the water.

Available choices: (a). Without adequate soil, outdoor plants can die and require a nutrient rich soil. Choose a soil that is relatively high quality and that will provide the proper moisture that plants require.. (b). Potting soil that is marketed for plants like kale-the florida variety-will work the best. These types of varieties are more durable, and are good for planting outdoors.. (c). Do not use glass or ceramic pots for indoor plants because they may be too high in the air for your plants to grow properly. Sand down the top of the soil with gentle scrapers.. (d). Change your soil every year or two. You should also check to make sure that your plant does not require special soil, such as clay, loam, sand, or peat... The answer should be
(d).