Answer: The correct option is C. Nucleus.
Nucleus is a specialized membrane bound organelle, which is localized in the center of eukaryotic cells. This organelle contains directions for the growth of cell and reproduction.
It contains the genetic material of the living organisms, which is DNA ( deoxyribonucleic acid). Cell cycle is necessary for the cellular growth and reproduction. The direction for this is given by the DNA as during cell cycle, growth and division of the cell takes place. Thus, one cell is converted into two cells.
Thus, nucleus contains direction for the cell growth and reproduction.