Answer:
Mitochondria.
Step-by-step explanation:
Eukaryotic cells have well defined nucleus and they have membrane bound cell organelle. Eukaryotes are more complex than prokaryotes and shows large differences.
Mitochondria is one of the most important cell organelle that present in all eukaryotes. The mitochondria is known as the power house of the cell and produce ATP that are important for the metabolism and survival of all the eukaryotic organism.
Thus, the correct answer is option (2).-