Answer: The correct answer for the fill in the blank is B) Survive on its own.
A single celled organism also called as unicellular organism can survive on its own. This is because it is capable of performing all the essential life processes like respiration, digestion, reproduction, locomotion, and excretion by its own.
Example of unicellular organism- Amoeba.
Thus, option B) is the correct answer for the fill in the blank.