Answer:
The correct answer will be option-nucleoid.
Step-by-step explanation:
A prokaryote is an organism which is formed during the primordial time, therefore, they lacked the organelles which can be observed in the later evolved life.
They can be easily distinguished as they lack certain organelles, the unique of which is the nucleus which protects the genetic material of the organism. The genetic material of prokaryote is present in either cytoplasm or in a nucleoid which could be thought as the primitive form of a nucleus.
Thus, option-nucleoid is the correct answer.