You will be given a definition of a task first, then some input of the task.
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".

[header] How to divide ferns [title] Water the fern generously two days before digging it up. [step] Make sure your fern is well-hydrated as the plant's ability to absorb moisture will be diminished for a week or two after it is divided because its root system will be compromised. [title] Dig up an outdoor fern with a shovel. <sep> (A) [step] Do this after it has been removed, and fill the trench or pit just below the fern's roots with soil, spray it down with topsoil, and shake gently to loosen any rocks. Add a couple of drops of ammonia or rubbing alcohol. (B) [step] Push the shovel straight down into the soil about 6 inches away from the fern stems, all the way around the fern. Then, push the shovel in again and lift the fern up out of the soil on the tip of the shovel. (C) [step] A plastic or a rubber shovel will work the best. Dig up as many ferns as you want. (D) [step] You can use a coarse hardwood spoon to do this. Only dig up the roots, not the leaves or stalks.
Output:
B