The correct option is C Coconut milk
Phytohormones are plant hormones such as auxin, cytokinin, gibberellins, ethylene and abscisic acid that accelerate the metabolic activities of the plant such as cell differentiation, cell elongation, etc. Hence these are also called as growth regulators. Coconut milk is known as a supplier of these growth regulators and so it is used in tissue culture media. Tissue culture is in vitro cultivation of plants, seeds and other plants parts for a variety of purposes. Thus the correct answer is option D.