Detailed Instructions: 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".
Problem:[header] How to care for common frog tadpoles [title] Get a container to use for a habitat. [step] The best container will be rather short and shallow, rather than deep. Having a wide top allows more air to be exposed to the air, allowing oxygen into the water. <sep> (A) The long side provides more room to move. [substeps] You may need it for more than one tadpole. (B) Good containers can be purchased at most pet stores, and are good for small numbers of tadpoles. You can easily reuse a container of your own, however. (C) [substeps] The container should fit the tadpoles' size. Frogs may swim in the container, but they cannot jump far while submerged. (D) A lid will also make the tank easy for tadpoles to access. [substeps] To make the waste deeper, add pebbles or dirt, to make larger tadpoles easier to keep.
Solution:
B