Question

two dna molecules, each with one old strand and one new strand
one dna molecule only, with two old strands
two dna molecules, one with two old strands and the other with two new strands
one dna molecule only, with one old strand and one new strand
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Explanation:

DNA replication follows the semi - conservative model. In this process, the two strands of the original DNA molecule separate, and each old strand serves as a template for the synthesis of a new complementary strand. So, at the end of replication, two DNA molecules are formed, each consisting of one old strand and one new strand.

Answer:

two DNA molecules, each with one old strand and one new strand