Please answer the following question: I'm taking a test and have to guess the right answer to the question after the article. Article: This is Catherine. She is from England. Her family name is Cooper. She is nineteen. Her father is a doctor. His name is Henry Cooper. He works in a hospital in London. Mrs. Cooper works there, too. Catherine is now in China. She studies in Beijing. She studies Chinese. She lives in that building with another girl. Her name is Betty Brown. She is from the USA. She studies Chinese, too. The two girls are good friends now. Question: How many people are there in the passage ? Options: A: Five. B: Three. C: Four. D: I don't know.
A:
C