Product of biotechnology is

The correct option is C All of the above
Biotechnology
The branch of biology that uses living organisms and their derivatives to produce products and processes beneficial to human beings is called biotechnology.
Biotechnology has influenced life in various ways as follows:

• Agriculture
• Recombinant therapeutics
• Molecular diagnosis
• Gene therapy
• Transgenic animals

Transgenic crop
Transgenic crops are the plants that have one or more foreign genes from another species introduced into them by artificial means. They are produced by the methods of biotechnology.

Biofertiliser
Biofertilisers are living microorganisms such as $Rhizobium$, cyanobacteria etc. which act as fertilisers and increase nutrients availability in the soil to meet the nitrogen requirements for plants.

Humulin
Humulin is a recombinant insulin, produced artificially in $Escherichiacoli$. It is produced by cloning genes of human A and B peptides of insulin separately in different $E.coli$ bacteria. In the end, disulfide bonds are created in between both the peptides to form functional insulin.

Final answer
(D) All of the above