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". 

[EX Q]: [header] How to learn to speak afrikaans [title] Take an introductory afrikaans class. [step] Enroll in an introductory class at a local community college, or at a language learning center. You can also find organizations dedicated to language learning online. <sep> (A) Online classes are convenient because you can learn at your own pace. [substeps] Taking an introductory class will help you develop a solid foundation in the language. (B) Online afrikaans are very easy to learn, and they are easy to translate. [substeps] You can get an introductory afrikaanic class at a language learning center. (C) [substeps] The language federation at the children's development center maintains a directory of all language learning organizations across all states. You can also find native afrikaans reading online through the font bar at the bottom of the page or clicking " language group " in the top right corner. (D) [title] Immerse yourself in afrikaans from a young age. [step] Select a language you are receptive to and that you truly understand.
[EX A]: A

[EX Q]: . four bikers at the start of the line <sep> (A) get no a jump. (B) are wearing different colors of uniforms and helmets, they are about to get start the race. (C) leave and race towards a parking lot on the right. (D) go on the parallel bars but they can't take off their bikes.
[EX A]: B

[EX Q]: [header] How to build a natural looking waterfall with a filtrific vanishing water system [title] Determine the path of the water feature. [step] When mapping out the path of your water feature, consider bends in the stream and waterfall drops. A natural looking stream channel should appear " ageless, " as if it has always been there. <sep> (A) [title] Figure out how thick the waterfall is. [step] Decide if it is a horizontal waterfall or an uphill stream, as natural looking streams typically come apart easier. (B) This opens up the drop space for the waterfall. [substeps] Your waterfall should look like a river channel with a naturally flowing stream, and be easily identified from sight. (C) [title] Determine where the current is pulling you. [step] By determining how the current will drag you, you determine how likely you are to build your waterfall. (D) To best accomplish this, choose a location with a slope. If you don't have much of a slope to work with, as an alternative you can choose to create water flowing from a boulder or rock grouping.
[EX A]:
D