In today's business world, _____ are the most widely used form of written communication.

A) text messages
B) instant messages
C) letters
D) memos
E) emails

Emails have become the most widely used form of written communication in the business world due to their convenience, speed, and ability to reach a large audience. While letters and memos were popular in the past, they are now less common due to the prevalence of email. Text messages and instant messages may be used for more informal communication, but they are not as widely used or accepted in a professional setting.