The correct option is B transformation of plant cell
A gene gun (biolistic gun) is a device used to deliver exogenous DNA, RNA, or protein to cells. In this process, particles of heavy metals are coated with a gene of interest. Then these micro-projectiles are fired into cell using mechanical forces for integration of desired genetic information into host cells. This technique is used to transform almost all types of cells (plant cell, human cells and other animal cells).