The synthesis of proteins for formation of spindle fibres takes place in

The correct option is A G${}_2$ phase
The synthesis of proteins for formation of spindle fibers takes place in G${}_2$ phase. G${}_2$ phase, or pre-mitotic phase is the third and final subphase of Interphase in the cell cycle directly preceding mitosis. It follows the successful completion of S phase, during which the cells DNA is replicated. G${}_2$ phase ends with the onset of prophase, the first phase of mitosis in which the cells chromatin condenses into chromosomes. G${}_2$ phase is a period of rapid cell growth and protein synthesis during which the cell readies itself for mitosis.

So, the correct answer is option C.