Strong Evidence of Semiconservative Replication of DNA Comes from the DNA

Strong evidence of semiconservative replication of DNA comes from the DNA molecule structure,in that

A) the DNA molecule has four distinct nitrogen base pairs, requiring minimal chemical bond reactions to replicate their sequence.
B) All these properties of DNA and the replication process are part of the evidence and definition of semiconservative replication.
C) the semiconservative replication is explained by the large number of enzymes that are each specialized for each step of replication.
D) the DNA molecule is double-stranded, allowing one original strand to be conserved while its replicate forms one strand.
E) the hydrogen bonds between paired DNA strands allows conservation of energy, at a lower level than covalent bonds would require.