The correct option is C Cytokinin
Morphogenesis allows the organism to grow and take its shape by the process of cell division and differentiation.
Cytokinins are the group of plant hormones which promotes cell division and differentiation in root and stem of the plant. It is involved in inducing morphogenesis.
Auxin and cytokinins are used in equal quantity in the growth media of callus it promotes shoot and root formation and finally leads to organogenesis.
So, the correct answer is "cytokinin".