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 change a drill bit [title] Loosen the chuck. [step] The chuck is piece on the end of the drill that loosens and tightens to hold the bit. Grasp the chuck with one hand while you hold the handle of the drill with your other hand. <sep> (A) Loosen the chuck by sliding the drill bit along one side. If you have known it already, it will already be loose, but there is a screw on the end of the piece that holds the bit in place. (B) Use extra leverage as you slowly press down on the chuck to loosen it. [substeps] Keep your eye on the chuck while you are tightening it. (C) Twist the chuck counterclockwise to loosen it. Another option is to pull the trigger gently while holding the chuck. (D) Begin to tighten the chuck by turning it clockwise so that the chuck remains firmly in place. Use your wooden allen or long-handled allen key to turn the chuck clockwise until it is firmly within the drill's circle.

SOLUTION: C

PROBLEM: [header] How to bathe a pregnant guinea pig [title] Select a shampoo. [step] There are all types of shampoos for pets. For your guinea pig, make sure the shampoo is made specifically for small animals (it should say so on the bottle). <sep> (A) Otc shampoos and chemical shampoos are good choices. Avoid shampoo labeled specifically for guinea pigs and those formulated for females. (B) This way, both animals can use the shampoo and their fur will be clean. While many shampoos claim to free your guinea pig from " reye's syndrome ", this actually isn't true. (C) [substeps] Make sure that it is specially formulated for pregnancy-therefore not designed for your guinea pig. You can get shampoo from the veterinarian. (D) A small animal-specific shampoo will keep your guinea pig's skin from drying out or becoming irritated. Since your guinea pig is pregnant, the shampoo should also be non-medicated to prevent ingredients absorbing through her skin that could harm her unborn babies.

SOLUTION: D

PROBLEM: [header] How to melt chocolate chips [title] Fill a saucepan with 2 inches (5.08 centimeters) of water. [step] You can use an actual double boiler, or improvise your own with a saucepan and a heat-safe bowl. Do not place the second saucepan or bowl on top just yet, however. <sep> (A) [title] Melt one cup (240 milliliters) of milk in a saucepan over medium heat. [step] You can use multiple a cup (240 milliliters), or you can use the entire pot. (B) [title] Place the chocolate chips into the saucepan and simmer them for 5 minutes. [step] This will create a process called " processing, " which means that the chocolate chips will break apart if they are not melted quickly enough. (C) [substeps] If you are using a bowl, make sure that it fits comfortably over the saucepan and that there are no gaps where heat can escape. Double boilers are great if you need the chocolate to stay melted for a long time (ie: when you are making chocolate dipped strawberries). (D) [substeps] The heat of the water will help melt the chocolate chips. Make sure that the temperature of the water is roughly nine to 12 degrees fahrenheit (4 to 5 degrees celsius).

SOLUTION:
C