Explanation:

- Option 1: White blood cells

- Part of the immune system.

- They fight infections and other foreign invaders.

- Not responsible for energy production.

- Option 2: Plasma membrane

- Also known as the cell membrane.

- It protects the cell and regulates what enters and exits.

- Not involved in energy production.

- Option 3: Mitochondria

- Known as the powerhouse of the cell.

- Generates energy in the form of ATP.

- Essential for various cell functions.

- Option 4: Red blood cells

- Carry oxygen throughout the body.

- Not involved directly in energy production.