The correct option is A gene cloning
Cloning is a process wherein genetically identical copies of individuals or cells are produced.
In molecular biology, gene cloning refers to the process of producing multiple copies of a particular gene (DNA). This is also called gene cloning.
Restriction digestion is the process of cutting DNA molecules into smaller pieces with special enzymes called restriction endonucleases. Restriction enzymes are called molecular scissors as they cleave DNA at or close to different recognition sequences known as restriction sites.
Gene transfer refers to the insertion of genes into cells, mostly done with the help of vectors like plasmid.
Bioprocess engineering deals with the design and development of equipment and processes for the manufacturing of products on a large scale by using complete living cells or their components.