Which Would Be Considered Recombinant DNA

Multiple Choice

Which would be considered recombinant DNA?

A) A DNA molecule that was synthesized in the laboratory from nucleotides
B) A DNA molecule, constructed in the laboratory and derived from bacterial, cow, and yeast DNA
C) The DNA in a butterfly that is the hybrid of two species that mated in the wild
D) The DNA from two different bacterial strains that exchanged genes via horizontal transfer in a pond
E) Slightly degraded DNA from a bat found in a cave