The correct option would be blood.
Oxygen concentration
- The atmosphere has 21 percent oxygen.
- The trachea has virtually the same oxygen level as the atmophere
- The alveoli have about 98% oxygen.
- Tissue cells have a maximum of 18% oxygen.
- The blood has 95 to 100% oxygen concentration.
Thus, the area with the highest oxygen concentration is the blood.
More on oxygen concentration can be found here: https://brainly.com/question/3366914
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a) Atmosphere
b) Trachea
c) Alveoli
d) Tissue cells
e) Blood
