Histone protein synthesis occurs during

Explanation-

Cell division takes place through two processes-
Mitosis and Meiosis

Mitosis is an equational division. Here the chromosomes are equally distributed among the two daughter cells, whereas meiosis, is a reductional process here the chromosome number is distributed half to the daughter cells.

In the case of both mitosis and meiosis, the first phase is the Interphase.
In the interphase cell gets ready for further phases.

In G1-Phase- (First growth phase)
1. Cell is metabolically active.
2. Growth of the nucleus takes place
3. RNA and proteins are synthesized.
4. Nucleotides, amino acids for histone synthesis, and energy-rich compounds are formed.
5. Cell organelle grows in number.

In S-phase-(Synthetic phase)
1. The chromosome replicate.
2.  DNA content doubles from 1C to 2C for haploid cells and 2C to 4C for diploid cells.
3. Chromatin fibers are formed.
4. Histone protein synthesis for DNA replication.

In the G-2 phase-(Second growth phase)
The formation of RNA and protein continues.
Both cell and nucleus grow in size.


Final Answer-

So, The correct option is C (S-phase)