Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R). 
Assertion (A): If the cell had diploid or 2n number of chromosomes at G₁ phase, even after S phase the number of chromosomes remains the same, i.e., 2n.
Reason (R): There is an increase in the number of DNA but not in the number of chromatids.
In light of the above statements, choose the correct answer from the options given below. 

Assertion (A) is correct. During the S phase of the cell cycle, DNA replication occurs, resulting in the duplication of each chromosome. As a result, while the number of chromosomes remains the same (2n), the amount of DNA doubles. Therefore, after the S phase, the cell will have a diploid number of chromosomes (2n) but twice the amount of DNA (4c).

Reason (R) is incorrect. There is no increase in the number of chromosomes only the amount of DNA doubles.