Read the text below and answer the question. "In the 19th century, communication was largely dependent on letters delivered by post, which could take days or even weeks to reach their destination. Telephones were invented later in the century but were not widely available. People often relied on face-to-face conversations or sending telegrams for urgent messages." Which of these is a modern way of communication that was NOT widely available in the 19th century?
A) Sending letters