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". 

[Q]: [header] How to choose a protein supplement [title] Choose whey protein to build muscle. [step] If you're looking for muscle-building protein, whey protein is generally your best option. Whey protein can come in the form of powder or pills and is commonly used when people are trying to build muscle via things like weight training programs. <sep> (A) By doing this, you're gaining more body fat and growing more muscle at the same time. [substeps] Whey protein can be found in half of the packaged foods. (B) Whey protein is also a low-fat protein, rich in red blood cells from bacteria. Although whey protein does not impart healthy fats to the body, whey protein helps build muscle, which you can grow and burn through exercise. (C) [substeps] Look for a whey protein powder or supplement with a high biological value. This measures how well your body can absorb the protein. (D) Whey protein occurs as a food chain, hence the slogan, " protein is fat free ". [substeps] Whey protein is complex and varies from patient to patient.
[A]: C


[Q]: A graphic shows and then photos follow of a girl growing up with horseback riding. Three years after those photos the girl moves and she is shown riding horses. the girl <sep> (A) is shown with other girls posing with some awards for horseback riding. (B) then takes an exercise class and the lady shows her how to ride with the palomino. (C) continuously rides down the country with other riders. (D) is then interviewed by a man and she smiles and claps her hands.
[A]: A


[Q]: The man in green shirt is playing bongo drums. The man looked sideways and talked. the camera <sep> (A) zoomed in to the bongo and then zoom out and the man in green shirt continue to play the drums. (B) zoomed in to show the guys legs. (C) took a picture of the front and back of the accordion. (D) put the bagpipe down in a dimly lit room.
[A]:
A