Final answer:
The correct option is B). Approximately 7% of carbon dioxide is transported in the blood as dissolved gas in the plasma. The majority of CO2 is converted to bicarbonate for transport.
Step-by-step explanation:
The percentage of CO2 transported in the blood that is dissolved in the plasma is 7%. Carbon dioxide is transported in the blood through three primary methods: dissolution directly into the blood, binding to hemoglobin, or being converted to bicarbonate. While the majority of CO2 is transported after conversion to bicarbonate, approximately 5 to 7 percent of CO2 is dissolved in the plasma. This dissolved CO2 is carried to the lungs, where it diffuses into the alveoli and is exhaled.