The polymerase chain reaction (PCR):
a) enables researchers to determine the sequence of a complementary strand of DNA when they have only single-stranded DNA.
b) makes it possible to create huge numbers of copies of tiny pieces of DNA
c) utilizes RNA polymerase to build strands of DNA.
d) can create messenger RNA molecules from small pieces of DNA.
e) all of the answers are correct

Option B

Explanation:

The polymer chain reaction machinery, is basically DNA replication but on a grander scale. It is a laboratory technique that is utilized to make several copies of a segment/ fragment of DNA.

PCR is very precise and can be used to amplify, or copy, a specific DNA target sequence. Using PCR, copies of very small amounts of DNA sequences are greatly amplified in a series or cycles of temperature changes.

your answer would be a, maximum exploitation of resources.