It Is Difficult to Simply Introduce Foreign DNA and Transform

It is difficult to simply introduce foreign DNA and transform cells directly, so how do scientists often get the foreign DNA into the cells?

A) Bacteria cells readily take up foreign DNA, and once those are transformed, they can infect the cells of the desired species (rice cells in this case) .
B) By bathing the cells (rice cells in this case) with a solution of highly concentrated DNA, some will be taken up by the cells.
C) By specifically injecting the foreign DNA into the cell (rice cells in this case)
D) Bacteria cells take up the foreign DNA and then scientists inject those cells into the desired cells (rice cells in this case) .
E) By specifically injecting the foreign DNA into bacteria cells and then injecting those cells into the desired cells (rice cells in this case)