Most of the oxygen transported by the blood
a. bound to a plasma protein.
b. carried by white blood cells.
c. bound to hemoglobin.
d. dissolved in plasma.
e. in ionic form as solute in the plasma.

c. Bound to hemoglobin.

Explanation:

The oxygen is relatively insoluble in plasma. At normal atmospheric pressure, only 0,3% of oxygen dissolves. That why there are respiratory pigments that elevate almost 70 times the capacity to transport O₂ of blood. The most common respiratory pigments are hemoglobin (in all vertebrates and some invertebrates) and hemocyanin (in mollusks and arthropods).

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