In the past, people often used to write letters to communicate with relatives who lived far away. It would take weeks for a letter to reach its destination. Nowadays, we use smartphones and the internet to send messages instantly. Also, traditional family gatherings used to be more frequent and larger, with many generations living under one roof. Today, families are often smaller and live in separate homes, meeting less frequently. What is the main difference in communication between the past and the 21st century mentioned in the text?
A) People communicate more formally now.