Hello there!
Your question asks what individuals do that causes workplace communication to suffer.
Answer: Use text lingo or emoticons
The reason why "Use text lingo or emoticons" would be the correct answer because this is what causes workplace communication to suffer.
Text lingo are shorter versions of phrases. This causes communication in a workplace to suffer because people would start using text lingo more often and the quality of communication at a workplace would decrease.
Emoticons are faces that are made with a couple buttons. This also decreases the quality of communication in a workplace, which makes the communication in a workplace suffer, due to the fact that it makes people use more faces than actually communicating.
I hope this helps!
Best regards,
MasterInvestor