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 stretch to improve your flexibility [title] Warm up your muscles. [step] Perform 40 jumping jacks , 25 squats, run on the spot for 5 minutes, and ten press-ups or ten girl press-ups if you are not strong enough. [title] Start with simple stretches to get used to the concept and feeling of stretching. <sep> (A) [step] You can stretch on a ball or in the sky. Avoid attempting to do anything difficult or hard and figure out what you're doing properly. (B) [step] Does it feel to stretch? That is great. Start slow and do thirty chest presses before you reach bench pressing. (C) [step] Stretching is the single best way to exercise comfortably and to elevate your blood circulation. [title] Work your muscles with the backbend workouts. (D) [step] Stand up and stretch your legs into a wide straddle. Reach down until your palms rest on the ground, keeping your legs straight.
[EX A]: D

[EX Q]: [header] How to avoid common glass tile installation mistakes [title] Ensure color consistency behind glass tile. [substeps] Since glass can be the sole material in an installation, it is essential to choose a bonding mortar that meets its unique demands. In most cases, the color of the thin-set mortar was not an issue when installing opaque ceramic tile. <sep> (A) But with clear and translucent glass, the mortar appears through the tile: if the color varies in the mortar, it will in the glass tile too. To eliminate variations across a glass tile installation, choose a glass tile mortar with a bright white shade that is controlled to a consistent standard color. (B) [title] Find a masonry solution solution as described in this article. [step] Masonry solutions used to be sold in commercial suppliers were expensive and less durable than those containing glazed portions. (C) [title] Check your online repair and installation guide for common glass tile installation recommendations. [substeps] If you cannot find the recommended measurements, consult the manufacturer's website or consult the recommended supplies list. (D) Spray glass tile debris on the glass tile before continuing. Rinse glass tile debris with water and wipe the water away.
[EX A]: A

[EX Q]: [header] How to prevent hair color from bleeding [title] Use conditioner to keep color dyes from bleeding onto lighter hair. [step] During the dyeing process, coat lighter hair in conditioner to protect it. The conditioner will act as a shield when you rinse the dye itself out, lessening the unwanted contact that the dye has with your hair. <sep> (A) [substeps] Make sure the conditioner is water-proof for water dyes, as water can increase dye absorption into your hair. Do not use " water-proof " conditioner as this can affect color oxidation, and water can halt dye absorption. (B) [title] Wait 24 hours before shampooing your hair after getting it dyed. [step] Washing it too early can dislodge the coloring agents. (C) [title] Apply a heat protectant product to ensure your hair does not get too dry. [step] The most effective, but sometimes needed, heat protectant formulations are laser hair straighteners, which shrink hair with a low heat setting. (D) [title] Always apply conditioner to your dyed hair immediately. [step] Doing so will promote the color to fade, lessening the time it needs to remain in your hair.
[EX A]:
B