Genetic engineering is
Making artificial genes
Hybridization of DNA of one organism to that of others
Production of alcohol by using micro-organisms
Making artificial limbs, diagnostic instruments such as ECG, EEG, etc
As discussed in Biotechnology & Its Principles -
Genetic engineering is a technique to alter the chemistry of genetic material (DNA and RNA), to introduce these into host organisms and thus change the phenotype of the host organism. Hence, the correct option is (b).