Which online community characteristic specifies that for an online community to thrive,a significant proportion of its members must be active (e.g. ,post updates,make comments,upload content,etc) ?

A) Conversations.
B) Presence.
C) Democracy.
D) Standards of behavior.
E) Level of participation.

The characteristic that specifies the significant proportion of active members in an online community is the level of participation. Without active participation, an online community cannot thrive as members would not engage in conversations, share knowledge and resources, and contribute to the growth and development of the community. Therefore, E is the best choice for this question.