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 treat your customer while serving them [title] When the customer approaches your till point, greet them nicely. [step] This means you should acknowledge the customer with eye contact. Say " hello " and smile. <sep> (A) [title] Apologise for any wait, no matter how short. [step] The customer might not understand why they have had to wait. (B) [substeps] Also greet them in a professional manner. Always state your name, address, and similar things. (C) Offer him or her a fresh drink once in awhile. [substeps] Remember to shake each customer's hand. (D) If you don't meet their smile they'll get bored and start saying no. To greet the customer again, do a brief " hi " and introduce them to your horde.

SOLUTION: A

PROBLEM: [header] How to handle a dog's nightmares [title] Decide whether to wake up your dog. [step] When your dog is having a nightmare, your first instinct may be to wake up your dog. However, this isn't always the best idea. <sep> (A) Waking up your dog would disrupt its sleep cycle, causing it to feel confused and possibly lash out at you. It's often better to let a dog continue sleeping through the nightmare. (B) If your dog's nightmares persist and you aren't willing to take the time to monitor your dog, it might be best to enlist the help of a veterinarian. There are several reasons for this : [substeps] When your dog is having a nightmare, your own judgment is impaired. (C) If your dog is claustrophobic or is fear fearful, you will want to be as calm as possible while your dog is having the nightmare. If the fear is mild to moderate, choosing an alternative position or location may not be a good idea. (D) While nightmares are real, traumatic experiences can also happen. [substeps] Nightmares also occur in dogs that have nightmares caused by trauma.

SOLUTION: A

PROBLEM: [header] How to set up a fish tank for plecostomus catfish [title] Buy the right size tank. [step] Pleco catfish can be large, so it's important to have a tank big enough for their size and how many plecos you want to have. Plecos can be up to 15-24 inches long when they're fully grown. <sep> (A) Terrariums can be purchased at aquarium stores, from vendors, and online. [substeps] Terrariums are made of highly porous material and provide the best setup for plecos. (B) [substeps] Your tank should ratio should be 1 gallon of water for one inch of fish. Pleco catfish live for 20-30 years, so it will take them awhile to reach their full grown size. (C) They require lots of space in the tank and they can be pretty aggressive. A small 10 gallon (25 l) tank with at least 12 rows of plecos can also work. (D) Choose shallow water to accommodate your plecos, as they have a lot of space to move around. [substeps] Make sure the tank isn't deep enough for your plecos' heads to go under.

SOLUTION:
B