According to the endosymbiotic theory, large prokaryotic cells may have
engulfed smaller prokaryotic cells over 1.5 billion years ago. If the smaller
cells survived, the larger cells may have eventually evolved into eukaryotic
cells.
To which of the following organelles did the ingested prokaryotes most likely
give rise?
O
A. Lysosomes and nuclei
O
B. Chloroplasts and the Golgi apparatus
O
C. Nuclei and mitochondria
O
D. Mitochondria and chloroplasts

Endosymbiotic theory  is described below.

Explanation:

The first piece of evidence that needed to be found to support the endosymbiotic hypothesis was whether or not mitochondria and chloroplasts have their own DNA and if this DNA is similar to bacterial DNA. This was later proven to be true for DNA, RNA, ribosomes, chlorophyll (for chloroplasts), and protein synthesis.The endosymbiotic theory is the accepted mechanism for how eukaryotic cells evolved from prokaryotic cells. It involves a cooperative relationship between two cells which allow both to survive—and eventually led to the development of all life on Earth. The hypothesis that eukaryotic cells evolved from a symbiotic association of prokaryotes—endosymbiosis—is particularly well supported by studies of mitochondria and chloroplasts, which are thought to have evolved from bacteria living in large cells.The early eukaryote cell evolved more than a billion years ago. ... The smaller prokaryotic cell or bacteria lived on in the larger prokaryote, providing it with extra energy, while the larger cell protected the small bacteria, allowing it to survive.The endosymbiosis theory explains how eukaryotic cells may have evolved from prokaryotic cells. Symbiosis is a close relationship between two different organisms.Later, a host cell engulfed a prokaryotic cell capable of photosynthesis.Endosymbiotic theory.,A theory stating that the eukaryotes evolved through a process whereby different types of free-living prokaryotes became incorporated inside larger prokaryotic cells and eventually developed into mitochondria, chloroplasts, and possibly other organelles.

Giga is the second highest prefix on the normal scale, the first is terra.