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". 

Example Input: [header] How to prune dracaena [title] Prune your plants in the spring before they hit the growth period. [step] From april to may, your dracaena plant comes out of rest mode and gets ready to go into the blooming season. Pruning your plants before they hit the growth period keeps them healthy. <sep> (A) This also makes it easier to shape the plants into your ideal look. [substeps] While you can prune your dracaena whenever you'd like, this helps encourage new, healthy growth. (B) [substeps] Dig around your plant and dig through the leaves and stems. Then, break or slice up any missing leaves or stems. (C) Cutting back all the flowers is absolutely essential to maintaining the stage of the plants that produce most of the foliage and fruit. [substeps] Your herbs should be pruned throughout the spring rather than the summer as this can cause them to produce fewer blooms and appear stunted. (D) It promotes a firm, healthy growth cycle for the plant. [substeps] Use a small garden pedometer to determine how many plants you should prune.
Example Output: A

Example Input: A woman is playing a set of bagpipes in a room. she <sep> (A) begins to tap on the instruments, trying to play them in tune with each song. (B) laughs as a man helps her adjust the pipes, and continues to play. (C) goes back and forth, and she doesn't seem to be confident in her play. (D) strums them as she moves with the music.
Example Output: B

Example Input: [header] How to contrast biochemical reactions inside the body and chemical reactions in the chemistry laboratory [title] Define metabolic reactions. [step] Metabolic reactions refer to biochemical reactions that take place inside the body of living systems. This includes mammalians and microorganisms in addition to plants. <sep> (A) [substeps] Regulate the extent of metabolic reactions to distinguish them from outside or inside the body. Humans are categorized by their biochemical reactions. (B) This type of chemical reactions is characteristic of living tissues only. It is not observed in the chemistry laboratory for example. (C) They are both often called metabolic reactions because they form automatic connections between different bodies of the system. For instance, instead of a human's body producing gas, an electric circuit will create electricity generated from cells. (D) Motor reactions are physical reactions that take place in the body. They contain biological reactions that attack the environment, environmental reactions, and chemical reactions used for physical actions.
Example Output:
B