What is the primary function of the cytoplasm?

The primary function of the cytoplasm is to house organelles and maintain cell structure, which aligns with option C. The cytoplasm is the gel-like substance that fills the interior of a cell, providing a medium in which various cellular components, including organelles, can be suspended and supported. It plays a crucial role in facilitating the movement of materials within the cell and enabling biochemical reactions to occur, as many of these reactions take place in the cytoplasmic matrix.

In addition to housing organelles, the cytoplasm helps maintain the cell's shape and structural integrity. It supports and protects the organelles, ensuring they are positioned correctly to perform their functions effectively.

The other options focus on different aspects of cellular biology. The nucleus’s primary function is to store genetic information, which does not pertain to the role of the cytoplasm. While cellular activities are indeed controlled by various cellular mechanisms and the nucleus, this function does not relate directly to cytoplasm's role. Hence, option C accurately captures the essence of what the cytoplasm does within a cell.