TASK DEFINITION: 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".
PROBLEM: [header] How to make silver nitrate [title] Wear proper protective equipment. [step] The chemicals necessary for this process are highly toxic and can lead to injury if not handled properly. Eye protection, gloves, and a lab coat are necessary to remain safe. <sep> (A) You should also wear long, loose sleeves or long pants to protect yourself from these hazardous chemicals. Be sure you wear good quality work clothes. (B) Long pants and closed-toe shoes, preferably without mesh, should be worn to protect against floor spills. [substeps] Eye protection should completely cover your eyes and the sides of your eyes to protect from splashes. (C) Your lab coat can protect your skin and prevent pollution while working. Ask your local hazardous waste management company to provide you with an appropriate safety gear. (D) Wear full, protective safety gear as well to get the job done effectively. [title] Choose a location for your lab lab.

SOLUTION: B

PROBLEM: [header] How to paint masonry walls [title] Remove any flaked or peeling paint from the masonry. [step] If the wall has already been painted, you need to remove any old paint that is loose, peeling, or flaking away. On an exterior wall, this is most efficiently done with a sandblaster. <sep> (A) New paint must be removed from the wall first, gently scraping around the edges with a rat-tail tail reciprocating scraper. This is most often done on exterior paint walls that are still meant to protect it from debris. (B) In areas where a sandblaster would be too messy and cumbersome, loose paint can be removed with a stiff wire brush and a paint scraper. [substeps] Failing to remove loose and peeling paint can result in the paint flakes mixing in with your fresh coat of paint and marring the finish. (C) [substeps] Make sure to turn off the water. Do not flush the wall down the drain. (D) If there is a paint-resistant paint strip still clinging to the wall, it may be painted to the wall as well, but not directly under it. [substeps] Using a sandblaster may be wise, but if the paint is not taking off, it may be better to start by sanding lightly.

SOLUTION: B

PROBLEM: [header] How to derive the cosine difference formula [title] Draw your unit circle and label as needed. [title] Label the origin as point z with the ordered pair (0 , 0). [title] Label 0 degrees as point y with the ordered pair (1 , 0). <sep> (A) [title] Name the cosine equation scientifically integrated into the formula, and use the other cells along with the line to determine how much distance is divided. [title] Color the cosine equation in 360 c/180 f (= k420). (B) [title] Draw a special angle from the unit circle and label it angle a. [step] This gives us point x, which has the ordered pair (cosa, sina). (C) [step] Find your first container and label the radius-1 , 0.45. Most users use the amount of space in the compass to put the levout of the more circle diameter of the levout. (D) [step] The number x i from the atomic number is the sum of degrees. [title] Add this factor to your total number by adding an axis that is smaller than pi.

SOLUTION:
B