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 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 make a composite longbow [title] Select your wood. [step] Go to a hardware store or an archery store. Only cut live trees if you are sure it is a suitable wood, and are prepared to properly dry the wood. <sep> (A) [substeps] Non-live trees can be prepared for a shoot near a slope. However, live trees that have been broadcast on the news should be cut or damaged, to avoid soiling the tree. (B) Just-cut, wet wood won't work well. [substeps] Look for a board that's 6 feet (1.8 m) long , 1 " x2 ". (C) [title] Squeeze out the sap from each antler. [step] Squeeze each antler gently to release the excess sap in the old antler. (D) For smaller shoots, use white cedar or fir bark. If the shoot is large, use pine bark or maple bark.
[EX A]: B

[EX Q]: [header] How to identify a sphynx cat [title] Look for a sphynx coat. [step] The sphynx is sometimes referred to as the hairless cat. However, this cat's coat can range anywhere from a very short covering of fur to none at all. <sep> (A) This is caused by a natural genetic mutation. It does have a bit of fine hair around its nose, even when there is no fur anywhere else on the cat's body. (B) These cats are greyed at the base of their spines, and have sometimes dark spots. While some dyed fur may be a common feature, most sphynx cats only have stripes or patches. (C) [substeps] The sphynx is a clicker as opposed to a whistle. Avoid using a clicker if you are worried about hurting a dog. (D) You can also compare the than a sphynx coat with the other cats in your household. You can then decide how you want to use the coat.
[EX A]:
A