Answer: Endosymbiotic
Explanation:
The initial statement of the endosymbiont states that over a period of time the bacterial endosymbiont of the ancestral cell in the eukaryotic lineage loss the ability to live independently.
They can either become a chloroplast if the endosymbiont bacteria is photosynthetic or it can become a mitochondria if bacteria uses aerobic respiration.
hence, the correct answer is endosymbiotic.
