The question refers to the following table, which compares the percent sequence homology of four different parts (two introns and two exons)of a gene that is found in five different eukaryotic species. Each part is numbered to indicate its distance from the promoter (for example, Intron I is the one closest to the promoter). The data reported for species A were obtained by comparing DNA from one member of species A to another member of species A.
% Sequence Homology

\begin{array} { | l | l | l | l | l | } \hline \text { Species } & \text { Intron I } & \text { Exon I } & \text { Intron VI } & \text { Exon V } \\\hline \text { A } & 100 \% & 100 \% & 100 \% & 100 \% \\\hline \text { B } & 98 \% & 99 \% & 82 \% & 96 \% \\\hline \text { D } & 98 \% & 99 \% & 89 \% & 96 \% \\\hline \text { E } & 99 \% & 99 \% & 92 \% & 97 \% \\\hline\end{array}

Which of these four gene parts should allow the construction of the most accurate phylogenetic tree, assuming that this is the only part of the gene that has acted as a reliable molecular clock?
A) Intron I
B) Exon I
C) Intron VI
D) Exon V

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