Definition: 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 divide dwarf iris [title] Choose the correct time to divide the rhizomes of the dwarf iris. [step] Divide irises during the summer dormancy period into early fall, at least 6 weeks after the last blooms have faded. This gives the newly formed rhizomes time to become established. <sep> (A) [substeps] Other ideal times to divide the iris is between june and october/march between frost dates, and so forth. [title] Take the rhizomes with you if you decide to work in a garden. (B) [substeps] This does not work if the climate is generally safe for roaming through the forest during the summer. [title] Divide the rhizomes in the fall or early winter. (C) [substeps] Irises should be divided every 3 to 4 years or when the middle of the clumps look bald. Irises may indicate they need divided when the amount of blooms decrease from year to year. (D) [title] Divide the rhizomes of the dwarf iris in fall/early spring. [step] This gives the new plant a chance to get used to being divided as soon as it starts flowering.
Output:
C