Instructions: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 
Input: [header] How to grow flowers from seed [title] Get a container that has drainage holes in it. [step] If you want to grow multiple flowers, you can purchase an indoor planter that has spaces for more than one flower. It's important that the container has drainage holes because overly saturated soil will inhibit the seed's growth. <sep> (A) [substeps] You can purchase a container with holes, such as the back of a garbage can, or a seeding container. The container should be deep enough to allow flower roots to drain free. (B) [substeps] If you don't want to buy a planter, you can punch holes in the bottom of an egg carton and use that instead. Put a rag or cloth under the container to prevent leaks. (C) If you're planting flowers inside your garden, find an indoor planter that has drainage holes. [substeps] If planting multiple flowers in a row, get a larger container, if possible. (D) Water your planter again to make sure that it has drainage holes again. [title] Take the flower stem in your hand and gently hold it over the flower.
Output:
B