The correct answer is C
DNA >gene > chromosome > nucleus
DNA being the smallest molecule and the nucleus being the largest.
Step-by-step explanation:
DNA molecules are large and complex molecules that carry genetic code which determines the features of a living organism.
A gene is a short section of DNA molecules. Each gene is responsible for coding for a specific proteins by specifying the order in which amino acids are linked together.
The nucleus is an organelle that contains chromosomes that are made from long DNA molecules (genes), that are packaged in a complex manner around histone proteins.