What is a common disadvantage associated with using letters?

The rationale for selecting the option about letters potentially not being delivered highlights a significant limitation of traditional mail compared to digital communication. When businesses rely on letters to communicate, there are various factors that can interfere with successful delivery, such as postal delays, loss in transit, or incorrect addressing. This unpredictability can lead to important messages not reaching their intended recipients, creating issues in communication and potentially hindering business operations.

In contrast, the other factors mentioned in the choices address aspects that either do not accurately reflect the nature of letters or do not universally apply. For instance, the notion that letters are always delivered on time is misleading, as postal services can experience delays for a multitude of reasons. Similarly, suggesting that letters cost more than digital communication often overlooks the fact that while there may be printing and postage costs, many businesses still consider traditional letters as a cost-effective means of communication for certain contexts. Finally, characterizing letters as usually too informal does not resonate, as letters can be quite formal depending on their context, purpose, and audience.

Understanding this disadvantage allows businesses and individuals to weigh their communication options more effectively, recognizing that while letters can be valuable, they do come with inherent risks regarding delivery.