You will be given a definition of a task first, then some input of the task.
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 straighten the back of your hair [title] Wash your hair. [step] If your hair is fine, you should choose a lightweight, volumizing shampoo and conditioner. After you leave the shower, a volumizing mousse with heat protection is an excellent choice to defend your hair from heat damage. <sep> (A) This hair product offers different damaging effects than heat styling products, so you'll want to choose a conditioner that's also hydrating to cut and maintain the hydration necessary for your hair's overall appearance. [substeps] Select products specifically for your hair type for best results. (B) [substeps] If you have very straight or wavy hair, a leave-in shampoo will save your hair the energy it needs to straighten. All you have to do is apply a large amount of mousse to the ends of your hair, since they tend to be frizzy most of the time. (C) If your hair is thick/coarse, choose a smoothing shampoo and conditioner. Though not absolutely necessary for straightening your hair, when you exit the shower, you should consider a smoothing serum with heat protection to keep your hair undamaged. (D) [substeps] Follow up with the french conditioner or flat shampoo. If your hair is currently damp, you may opt for water instead.
Output:
C