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]: [header] How to handle having a toxic mother [title] Be aware that your mother might not realise that what's she's doing or saying is affecting you. [step] Try talking about it with her, telling her how you feel. You might be surprised to find that she's actually quite understanding; after all, she's human too. <sep> (A) [title] If you're really dealing with a toxic mother, be caring. [step] Basically, try your best to show she is not hurting you. (B) [substeps] You might be embarrassed, and really hurt. Try to talk to her about your feelings instead. (C) [substeps] You could say, " i feel frightened about what you're telling me. I wish i could make you feel better, but i don't know how. (D) [title] Choose the right time to talk it over. [step] There is a wrong time for you to have this conversation.
[A]: D


[Q]: [header] How to find electrons [title] Obtain a periodic table of elements. [step] This is a color-coded table that organizes all the known elements by atomic structure. Each element has a 1 , 2, or 3-letter abbreviation and is listed along with its atomic weight and atomic number. <sep> (A) [substeps] Periodic tables can easily be found in chemistry books and online. [title] Find the element in question on the periodic table. (B) You can obtain this table by purchasing an periodic table from a department store or buying it online. [title] Enter the atom and element number into a set of figures. (C) This list must match or exceed 1 , 024 atoms. [substeps] Finding the ratio of atomic weight to atomic mass can be tricky, especially if there are not any known atomic weight units. (D) [title] Multiply the atomic weight by multiplication. [step] You need to multiply it by the atomic mass in that atom to find electrons.
[A]:
A