I believe the answer is: Public speaking
There are three major purpose for someone to conduct a public speaking. The first one is to inform the audience, the second purpose is to persuade the audiences to do something, and the third purpose public speaking is to entertain the audiences.
There are lifelong health implications, both physically and mentally, in teenagers with eating disorders. The act of binging causes digestive issues, namely massive stretching of the stomach. Purging leads to tooth decay, esophageal erosion, ulcers of the throat, stomach, and mouth. Both bulimia and anorexia result in malnutrition. Malnutrition leads to several different cardiac issues, primarily weakening of the heart muscles. It is not uncommon for people suffering from eating disorders to also suffer heart attacks earlier in their adult life than what is typically seen among adults. There are several muscular and skeletal problems noted in the same community. As the body breaks down its muscles and takes calcium from the bones, the individual is left with very little muscles, minimal strength, limited endurance, and often osteoporosis and brittle bones. Aside from the physical aspect, there is also a lifelong mental health battle. Proper treatment from a mental health professional highly skilled in such matters is extremely important.
C. Transportation
All these systems allow for faster travel of good and more efficient movement of people.
The question is C.I hope this helps