In the past, communication relied heavily on letters, which could take weeks or even months to reach their destination. People often waited anxiously for news from distant relatives or friends. Today, with the advent of the internet and mobile phones, instant communication across the globe is commonplace. Video calls allow us to see and speak to loved ones thousands of miles away in real-time. This shift has dramatically altered how we maintain relationships and conduct business. What is the main difference in communication between the past and the 21st century, according to the text?
A) People in the past wrote more letters than today.