Mitochondria Contain Their Own Double-Stranded, Circular DNA and Replicate on Their

Mitochondria contain their own double-stranded, circular DNA and replicate on their own. Why don't they suffer the same consequences as our cells in terms of limited division?

A) Because they have high telomerase activity.
B) Shortening of the DNA is only a problem with nuclear DNA; shortening of mitochondrial DNA isn't catastrophic.
C) Because mitochondrial DNA is circular, it doesn't shorten when it replicates.
D) Since mitochondrial DNA only contains a few genes, it can last a lot longer.
E) Because they have high telomerase activity and their DNA is circular and so doesn't shorten in replication.