Even worse, subjects were much more confident in their interpretations of the emails from friends, raising the likelihood of misunderstanding and offense.

In sentence 6 (reproduced below), the writer wants to develop the argument of the passage by contrasting two types of metamessages.

But whereas the meanings of metamessages conveyed by body language and voice are widely understood, metamessages surrounding digital communications can evolve very quickly.

Which of the following versions of the underlined text would best accomplish this goal?

A.(as it is now)
B. those of metamessages in digital communications often are not
C. studies show less attention to metamessages in digital communications
D. the appropriateness of a metamessage may differ between types of digital communication
E. it is not always easy to tell whom you are communicating with online, or how to interpret metamessages.