The correct answer is C. cytokinins.
Cytokinins are a group of plant hormones that promote cell division, cell expansion, and differentiation. They are also involved in the regulation of plant growth and development, including the initiation of flowering, the development of fruits and seeds, and the response to environmental stress.
Auxins are a group of plant hormones that promote cell elongation and growth. They are also involved in the regulation of plant development, including the formation of roots and shoots, the development of leaves, and the response to gravity.
Gibberellins are a group of plant hormones that promote stem elongation, leaf expansion, and seed germination. They are also involved in the regulation of plant development, including the initiation of flowering, the development of fruits and seeds, and the response to environmental stress.
Dormins are a group of plant hormones that inhibit growth. They are also involved in the regulation of plant development, including the dormancy of seeds and buds.