Teacher: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".
Teacher: Now, understand the problem? Solve this instance: [header] How to get rid of cattails [title] Dig up the cattails. [step] To get rid of cattails, you need to completely remove the root system. Cattails propagate through rhizomes. <sep> (A) These rhizomes can eat away leaves, bark, and other underground materials from inside. Soaking a particularly smelly plant, like moss, will help destroy the rhizomes. (B) [substeps] Place one corsage, placing it right up on top of a gap of soil. Sow a seed about 10 in (25 cm) deep into the soil. (C) If you don't uncover the root system, you run the risk of introducing other beneficial cultivars. You should shovel manure or compost at your local garden center to get rid of the cattails. (D) The rhizomes send out additional roots horizontally, quickly resulting in new plants. Manual removal is most effective if you dig out the rhizomes when cattails are first establishing themselves in a pond.
Student:
D