Palaeontologists unearthed a human skull during excavation. A small fragment of the scalp tissue was still attached to it. Only little DNA could be extracted from it. lf the genes of the ancient man need to be analysed, the best way of getting sufficient amount of DNA from this extract is?

• A. Subjecting the DNA to polymerase chain reaction
• B. Subjecting the DNA to gel electrophoresis
• C. Treating the DNA with restriction endonucleases
• D. Hybridising the DNA with a DNA probe