The Mitochondrial Genome Consists of Circular DNA with No Associated

The mitochondrial genome consists of circular DNA with no associated histone proteins, although it is complexed with other proteins that have some histonelike properties. The sizes and structures of mtDNA differ greatly among organisms. Human mtDNA exhibits extreme economy, but mtDNAs found in yeast and flowering plants contain many noncoding nucleotides and repetitive sequences. Mitochondrial DNA in most flowering plants is large and typically has one or more large direct repeats that can recombine to generate smaller or larger molecules.
-Which of the following characteristics applies to ancestral mitochondrial genomes?

A) Have genes with many introns
B) Contain more genes than derived genomes do
C) Possess much noncoding DNA between genes
D) Have nonuniversal codons