The correct option is A Biotechnology
Biotechnology deals with techniques of using live organisms or enzymes from organisms to produce products and processes useful to humans. According to The European Federation of Biotechnology (EFB) definition - biotechnology is the integration of natural science and organisms, cells, parts, thereof, and molecular analogues for products and services.
Genetic engineering is a technique to alter the chemistry of genetic material (DNA and RNA).
Pathology is the study of the causes and effects of disease or injury.
Conchology is the study of mollusk shells.