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 prevent spider mites on houseplants [title] Keep your houseplants hydrated. [step] Watering your houseplants as needed on a regular basis will prevent spider mite infestation, since spider mites only thrive on houseplants that are dry. [substeps] Use cold water instead of lukewarm water to water your houseplants. <sep> (A) It is recommended to be sure that every day you water your houseplants, you may see spider mites appear on the " float " on the water bottles. In some cases, spider mites may appear as large clusters, rather than a single cluster. (B) If you do not have a tank, place plants in small jars or bowls that can drain into the tank regularly. [title] Plant your plants in terracotta or porcelain pots. (C) This may prevent weak, poorly hydrated houseplants from being able to survive an infestation. [title] Defrost your plants every six to eight weeks. (D) Spider mites will not infest your plants if the temperature is too cold. [title] Remove dust from your houseplants once per week.
Output:
D