The correct answer is option 2: Mitochondria. Mitochondria are often referred to as the "powerhouse of the cell" because they are responsible for producing energy in the form of adenosine triphosphate (ATP). ATP is the main source of energy used by cells for various metabolic activities.

Let`s analyze the other options to understand why they are not the correct answer:

1. Plastids: Plastids are responsible for various functions in plant cells, such as storing pigments, starch, and oil. They are not directly involved in energy production.

3. Golgi bodies: Golgi bodies are involved in processing, packaging, and distributing proteins in the cell. They play a role in intracellular transportation, but not energy production.

4. Cell wall: The cell wall provides structural support and protection to plant cells, but it does not generate energy.

Therefore, the correct answer is mitochondria, which are known as the "powerhouse of the cell" due to their role in energy production.