Answer:
Remember that correlation does not imply causation. Just because two things have a correlate with one another, it does not mean that we can jump to an conclusion.
If we look at the graph below, we can see that the rate of diagnosed autism and sales of organic food have an almost perfect correlation. However, we know for a fact that organic food does not cause autism- it just so happens that they correlate with one another.
That is why correlations cannot show cause and effect. To prove that a correlation does so, further studies and experiments must be done.
D. Which of his or her friends should write a letter
People who suffer from anorexia tend to be skinner than those who suffer from bulimia. Both are eating disorders that deal with a person going through unhealthy measures to be skinny or feel skinny. People who have anorexia may actually starve themselves or feel when they are really underweight, while people with bulimia may overeat and than purge themselves for feeling guilty and fat.