You Are a Molecular Evolutionist and Have Found Five Successive

You are a molecular evolutionist and have found five successive ancestors of today's Arctic lemming (a type of rodent) frozen in the Arctic permafrost.You sequence the genomes of these ancestral lemmings and the modern lemming.For most genes, if you graph the number of actual substitutions on the x axis and the number of observed substitutions on the y axis, the slope of this graph will most likely

A) be more or less constant and approximately 0.
B) be more or less constant and approximately 1/2.
C) be more or less constant and approximately 1.
D) start off around 0 and increase with increasing divergence.
E) start off around 1 and decrease with increasing divergence.