Given the task definition, example input & output, solve the new input case.
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: [header] How to create a christmas tree forest [title] Consider the type of tree you want to plant. [step] There are a wide variety of christmas trees and include fir, pine, spruce, cypress, and cedar. These trees thrive in different climates and look different from one another. <sep> (A) It is important to research the tree before setting up your tree to try it out to make sure you can write the tree's growing season so that you can get the most supplies you need. If you're just interested in having a tree stand out, then make sure to check for the following : [substeps] Spruce trees. (B) [substeps] Trees green may be used in a mix of green and evergreen. Greens, such as pintos and olive oil, may be more delicate than these. (C) Where the trees grow together is up to you. [substeps] Spruce trees light up the night for hours in the morning and drown out the morning sunrise between afternoons. (D) Think about where your tree forest will be located and choose a tree that can thrive in that climate. [substeps] Balsam firs are a popular christmas tree species that grow in the northern united states and canada, in hardiness zones 3-5 or states like minnesota, north dakota, and montana.
Output: D
This is a good example. Only option D is about Christmas trees. So, it's the correct option.

New input case for you: [header] How to fish in a river [title] Get a good quality fishing pole. [step] A good fishing pole would be one that has a sturdy, fiberglass or graphite, a line that won't snap easily, and other features that actually work. Choose a good size for the fishing pole, such as is 8 feet (1.5 meters). <sep> (A) The longer the heavier the line, the more difficult the fishing should be. Choose a pole that can be tied to the three lengths of the rod. (B) [title] Choose good bait to take for the fish you're looking to catch. [step] Fish that live in rivers, such as sturgeon, bass, carp, catfish, etc. (C) You will be using a wider rod for shallower water, and the longer line for deeper water. [substeps] Recommendations are the thickest fishing pole that fits the sphagnum moss. (D) [substeps] How you fish is a big time! You are going to be fishing in a river. If your fishing line is too long, you'll have a lot of trouble measuring it.
Output:
B