Which one of the following statements accurately reflects the nature of mature communities?

A) Mature communities have more consumers than producers, because the producers are so efficient.
B) Mature communities develop very quickly.
C) Succession begins once a mature community has been established.
D) Mature communities are so well established that when disturbed, they quickly recover.
E) Mature communities are the most efficient in terms of energy utilization and exhibit the greatest species diversity.