Q: 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 care for a crested guinea pig [title] Give your guinea pig the largest possible cage. [step] A larger cage will give your pet more space to get some exercise, which is important for guinea pigs. Since guinea pigs don't use wheels or balls for exercise, the larger cage is more important because it allows them space to run around. <sep> (A) [substeps] For one guinea pig, your cage should be at least 2.5-feet (. 76 meter) by 3-feet (. (B) However, avoid letting your guinea pig run around inside a cage that is too small as it may make it difficult for them to move around. [substeps] Their cage needs to be longer than their cage so that they can stretch their bodies and get exercise. (C) Guinea pigs are nocturnal animals and need at least 8 hours of sleep a night. [substeps] If your pig is making noise, keep the door closed so she can sleep. (D) [substeps] If your guinea pig has an agile instinct, it will not have extra room to run around in. If a companion guinea pig has an agile instinct, it can easily get used to having a larger cage.
A:
A