Answer: a. everyone interprets the world differently.
The reason why learning to communicate effectively is so difficult is because everyone interprets the world differently. The experiences that each person has are so individual, that the words used to describe them are often incapable of replicating the experience for someone else. However, there are things we can do in order to improve our communication skills, such as having a large vocabulary, as well as being willing to engage in different types of communication.