The correct option is C X-Ray diffraction
Genetic engineering is a technology that was developed to controls traits of an organism by introducing desirable changes in its genetic constitution. DNA profiling, gene mapping, DNA finger printing, etc., are a part of genetic engineering.
On the other hand, X-Ray diffraction (XRD) is one of the most important non-destructive tools used to obtain information about the structure of crystals, fluids, etc.