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". 
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Question: [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.

Answer: C


Question: [header] How to change a drill bit [title] Loosen the chuck. [step] The chuck is piece on the end of the drill that loosens and tightens to hold the bit. Grasp the chuck with one hand while you hold the handle of the drill with your other hand. <sep> (A) Loosen the chuck by sliding the drill bit along one side. If you have known it already, it will already be loose, but there is a screw on the end of the piece that holds the bit in place. (B) Use extra leverage as you slowly press down on the chuck to loosen it. [substeps] Keep your eye on the chuck while you are tightening it. (C) Twist the chuck counterclockwise to loosen it. Another option is to pull the trigger gently while holding the chuck. (D) Begin to tighten the chuck by turning it clockwise so that the chuck remains firmly in place. Use your wooden allen or long-handled allen key to turn the chuck clockwise until it is firmly within the drill's circle.

Answer: C


Question: [header] How to be a good band girlfriend [title] Show up when you can. [step] One way to support your partner is to just be there when he or she is playing. Showing up to gigs when they are in town and when you have the opportunity to do so to lets your partner know that you support his or her art. <sep> (A) Also, if your partner is doing it on the weekends, put in a good effort. You could always rent tickets to local shows if they are open in your area, but it is not necessary. (B) The better you know your significant other, the better your life will be. [substeps] Give your partner a ride to his or her first gig or the event they're attending. (C) Supporting your partner can also help show him or her love for music. If your partner really likes albums from artists you admire, compliment him or her on his album collection. (D) [substeps] That doesn't mean you need to come to every show. In fact, sometimes it's good to develop your own interests and spend time with other people.

Answer:
D