instruction:
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". 
question:
[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.
answer:
A


question:
[header] How to remove paint from a car exterior [title] Park the car on top of a large tarp or drop cloth to contain the old paint. [step] The old paint should be disposed of instead of letting it contaminate the ground. If an open area is not available, park the car inside a garage, but open all of the garage's windows and doors for ventilation. <sep> (A) Cover objects inside the garage to protect them from the paint dust. [title] Use masking tape to cover the areas of the car that won't be sanded. (B) Alternatively, use a flashlight to check beneath the tarp. [title] Use an old baseball bat, crowbar, pry bar, or other large object to push the old paint off of the vehicle. (C) [title] Wipe the paint with a wet cloth, a roller wrap or an old towel to protect it from oil and water. [step] The paint is likely to collect on these cloths and make them easier to clean as they are removed. (D) If your garage is not well ventilated, a ventilation device will block your windows when the old paint has dried to a mud-like consistency. [title] Pour a small amount of vinegar into a small bucket.
answer:
A


question:
[header] How to add food coloring to food [title] Choose your type of food coloring. [step] Different food coloring options have different advantages, so you may decide based on the ease of use, amount of use and richness of the color. [substeps] Traditional liquid food coloring is available in supermarkets, craft stores and online. <sep> (A) Liquid coloring doesn't contain as many unique colors as traditional liquid food coloring, so think ahead and select the best type of food coloring for your food preferences and your own skill set. Most coloring comes in liquid, powdered and seed form. (B) It comes in 4 different bottle colors: red; yellow; blue; green. It can be messy to work with, and it can permanently stain clothes in its concentrated form. (C) However, you can purchase food coloring from a local craft store. Commercial food coloring can also be obtained online or in paint stores. (D) Look for the product's name on its packaging or a word used to describe where the food comes from and how it is produced. Eye-green food coloring is very coarse and can be found in local organic foods.
answer:

B