Answer:
The correct option is A. Insert the gene from a different species in the vector, infect a plant cell with the new gene, and grow a plant from the cell.
Step-by-step explanation:
Transgenic plants can be described as plants which have a foreign gene inserted into their genome. Genes with the desired traits can be incorporated into plants by this method.
The gene of interest is selected and incorporated into vectors like plasmids. The vectors have multiple cloning site or recombination sites where the foreign gene can be incorporated. The vector is introduced into the plant where it multiplies.