These are called the powerhouse of the cell.
Mitochondria
The correct option is A.
Explanation of the correct option:
Mitochondria breaks down the food or oxidizes the food to release energy and that's why they are called as the powerhouse of the cell.
Explanation of the incorrect option:
Option B:
Option C:
Nucleus controls all the functions of the cell and hence it is known as the control center or the brain of the cell.
Option D:
Cytoplasm is the jelly like substance found within the cell membrane which contains all the cell organelles.
Thus, Mitochondria are called the powerhouse of the cell.