Cal Believes That a Larger Percentage of a City's Population

Cal believes that a larger percentage of a city's population will engage in public displays of affection in highly populated cities due to feelings of anonymity when an individual is among a lot of other people. He rides a bus in densely populated New York City for five hours straight, watches the bus riders' interactions with each other, and unobtrusively counts the number of couples who are holding hands, hugging, or kissing. He then does the same in the sparsely populated city of Rock Falls, Iowa.
-What is Cal's theory?

A) People will display more affection in densely populated cities because they feel anonymous.
B) People in New York City will be more affectionate than people in Rock Falls, Iowa.
C) Couples are more affectionate when there are a lot of other people around to watch them.
D People who ride public transportation are more likely to hold hands, hug, and kiss than people who do . not ride public transportation.