Use This DNA RFLP Pattern of Evidence from a Rape

Use this DNA RFLP pattern of evidence from a rape investigation to answer the following question(s) .
$\begin{array}{c}&\text{ Semen}\\\text { Blood of } & \text { Recovered } & \text { Blood from } & \text { Blood from } & \text { Blood from } \\\text { Victim } & \text { from Victim } & \text { Suspect A } & \text { Suspect B } & \text { Suspect C }\\&&-\\-\\&-\\&&-\\&&&-\\&&&&-\\-\\&-\\&&&&-\\\end{array}$
-Note that suspect B has only one band in his lane. This is most likely an indication that:

A) band shifting occurred.
B) his DNA was contaminated during the collection process.
C) he is homozygous for the gene.
D) he did not provide a complete sample to the laboratory.
E) he is trisomic for the trait.