Which membrane-bound organelles, first discovered in 1857, are often referred to as the ‘energy factories’ of the cell because they are responsible for making adenosine triphosphate (ATP), the cell's main energy-carrying molecule?

Mitochondria

 The correct answer is Option (3) -Mitochondria

Mitochondria

Mitochondria are often referred to as the "energy factories" of the cell because they play a crucial role in generating adenosine triphosphate (ATP), which is the primary energy currency of the cell. These membrane-bound organelles were first discovered in 1857. Mitochondria are involved in cellular respiration, a process that converts nutrients into ATP, providing the energy necessary for various cellular activities.