Final answer:
Hootsuite allows users to create a dedicated comment stream to stay on top of important conversations in a long comment thread.
Step-by-step explanation:
The correct answer is D) Comment Stream. When a comment thread becomes long and hard to keep track of, Hootsuite allows users to create a dedicated comment stream to stay on top of the action. This feature helps users focus on important conversations and ensures that they don't miss any updates or exchanges within the thread.