Answer:
(3) Gene --> Chromosome --> Nucleus
Step-by-step explanation:
Genes are contained in chromosomes, which are in the cell nucleus.
If we take a look, we can see that the nucleus contains chromosomes. These chromosomes contain genes.
Genes are segments of DNA which contain specific instructions for specific functions. Chromosomes are structures inside the nucleus that contain a person's genes.
In simple words: Inside the Nucleus there are chromosomes that contain genes.