What does the nucleoplasm contain?

The correct choice highlights that the nucleoplasm contains the nucleolus and chromatin, which are essential components found within the nucleus of a cell. The nucleolus is the site of ribosomal RNA synthesis and is a critical structure for the assembly of ribosomes, while chromatin consists of DNA and proteins, forming the genetic material of the cell in a condensed form.

By correctly identifying the presence of these components, the choice underscores the nucleoplasm's role as a gel-like substance that holds the structural components of the nucleus together and provides a medium for the cellular machinery necessary for various genetic functions. This indicates the significance of the nucleoplasm in maintaining the nucleus's integrity and involvement in the process of gene expression.

Other options do not fully encapsulate what is found within the nucleoplasm. While they may refer to components associated with cellular function, they do not accurately represent the structures contained specifically in the nucleoplasm, emphasizing why the answer regarding chromatin and the nucleolus is the most comprehensive and accurate.