The Poplar, a Type of Tree, Does Not Produce Flowers

The poplar, a type of tree, does not produce flowers until it is eight years old. How does this characteristic make the poplar a good candidate for genetic engineering?

A) The slow growth rate of poplars makes it easier for every cell of a tree to be genetically modified with a gene gun.
B) Plants reject recombinant DNA when they start reproducing. The longer than normal maturation time of poplars extends the usefulness of the plant in processes like bioremdiation.
C) Plants do not begin producing the gene products of recombinant DNA until after they mature and begin reproducing. The shorter than normal maturation time of poplars allows them to become useful faster.
D) It is easy to prevent poplars from spreading recombinant DNA to wild tree populations since you can cut them down before they start reproducing.