The correct answer is option (C) organelles.
A cell is a structural and functional unit of living organisms. A typical cell has a cell boundary called the cell membrane or the plasma membrane, inside which the jelly like cytoplasm is present. The cell also has dense nucleus with genetic material inside it. The cytoplasm contains the different units of a cell called the cell organelles. They include the endoplasmic reticulum, golgi apparatus, lysosomes, ribosomes, mitochondria and other cell organelles. Thus, if each part of a lake represents parts of the cell, the embankments represent the cell membrane, the boat is the nucleus, water represents the cytoplasm, then the fishes inside the lake represents the cell organelles of the cell.