Answer:
The crime lab MOST likely wants to use Polymerase Chain Reaction (PCR) to create coples of DNA (D).
Step-by-step explanation:
A DNA thermal cycler is a piece of laboratory equipment used in Polymerase Chain Reaction (PCR), a laboratory technique used to amplify specific DNA sequences. During PCR, the DNA sample is subjected to repeated cycles of heating and cooling, which causes the DNA to denature and anneal to primers (short DNA sequences complementary to the target DNA sequence). The heat-stable polymerase enzyme then extends the primers, synthesizing new complementary DNA strands. This results in the amplification of the target DNA sequence, creating millions to billions of copies of the specific DNA sequence in just a few hours.
Thus, the most likely reason why the crime lab would want to purchase a DNA thermal cycler is to use PCR to create coples of DNA (Option D).