Answer:
C. DNA polymerase
Step-by-step explanation:
DNA polymerase is the enzyme that makes new DNA strands using existing DNA strand as a template. Use of radioactive deoxyribonucleotides as raw material for DNA synthesis makes DNA polymerase to use these radioactively labeled dNTPs to make new DNA strands.
Hence, DNA polymerase enzyme can make radioactively labeled DNA by using radioactive deoxyribonucleotides as raw material.