What Does the Graph Below Show

Multiple Choice

What does the graph below show?

A) Both groups show a positively skewed distribution.
B) Both groups show a negatively skewed distribution.
C) For those who used nicotine patches there is a fairly normal distribution, whereas those who used hypnosis show a slightly negatively skewed distribution.
D) For those who used nicotine patches there is a fairly normal distribution, whereas those who used hypnosis show a positively skewed distribution.