Please answer the following question: Read the following article and select the best answer. Article: In China, many students spend  their weekends studying at school or doing homework at home.What are the students doing on weekends in America? Kathy: We're washing people's cars. My friends and I are working together. The money we get is for our school basketball team . Tom: I'm watching an interesting movie with my friend. It's noon. My friend is laughing  at something, so now I am laughing , too. We're laughing at the interesting dog in the movie. Tony: I'm with my grandmother in the park. My parents are working today. We're playing and talking. She and I are good friends. She's telling me interesting stories. Kitty: I'm sitting in bed with my notebook computer. It's 11:00 at night. I'm writing letters to my friends. They are in other countries . When I think of them, I'm very happy. Question: Kitty is   _   with a notebook computer. - writing a story - playing computer games - watching a movie - writing letters
Answer:
writing letters