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 grow cactus indoors [title] Take a cutting from a healthy cactus. [step] You can grow new cacti from a pup that shoots off of a healthy mother plant. Choose a pup that's plump, unblemished, and healthy. <sep> (A) Gently cut or break off an entire pup from the plant. [substeps] You can also buy cacti at local nurseries, home stores, and garden centers. (B) Get a sharp knife and trim the tip of the plant. [substeps] It's okay to only use your blade during winter. (C) Make sure the mother plant is in a well-drained area so they can develop roots as a mature plant. [substeps] Avoid cuttings unless the mother plant's roots are quite large and thick. (D) You can also find mature young cuttings from a breeder or farmer if you like the look of a colorful cactus. Cacti have small shoots that cause their roots to wrinkle and become brittle when they're cut.
Student:
A