Answer:
Option B
Step-by-step explanation:
The answer is "cellular differentiation" or option B. Cellular differentiation is the process cells use to transform from one cell to another. During this process complex organisms develop specialized tissues and happens many times throughout the human life. Most common for multicellular (complex) organisms when they are in the developing stages of their body but continues to happen even when the organism is in adulthood.
Hope this helps.