Given the task definition and input, reply with output. 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 get your grandmother to stop smoking [title] Share with your grandma that tobacco causes cancer. [step] Lung cancer is the most common type of cancer brought on by smoking, but smokers also have an increased risk for cancer of the throat, kidney, esophagus, bladder, stomach, colon, rectum, and cervix. Cigarettes contain at least 69 chemicals known to cause cancer. <sep> (A) Your grandma will usually have to quit smoking immediately if her smoking troubles her. She will usually quit smoking 2-4 months before she smokes, if at all. (B) The aim when sharing this information with your grandma is to make her feel safe and comfortable. [substeps] Don't smoke heavily since quitting will give you an opportunity to talk it out openly. (C) This compelling information will surely dissuade your grandmother from smoking. [substeps] Cancer is usually determined by medical diagnosis, but some symptoms are easy to identify. (D) These chemicals go into the body which, when not fully absorbed, can lead to severe stomatitis. [substeps] Use discretion when infusing smoke.
C