Answer: The correct answer is-
B) mitochondrion.
Mitochondria is a membrane bound specialized organelle that is present in both animal as well as plant cell.
It is considered as power house ( energy producing factory) of the cell as it produces large amount of energy (in the form of ATP) through metabolic process called cellular respiration. This energy is further utilized for driving various cellular processes.
Thus, option B) is the right answer.