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".

[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.
A

[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.
D

A man dressed in a black suit and woman dressed in a black dress are dancing together to latino music. they <sep> (A) are doing a combination of ball room dancing and waltz. (B) are both very into it so takes a bit of time they both come back dancing and laughing. (C) are grabbing each other's hands in the middle of the stage, holding hands an dance together. (D) orotund from the song title and dance in unison.
A