The correct option is D Carbaminohaemoglobin, carbonic acid and dissolved in plasma
Blood is the medium of transport for oxygen and carbon dioxide. About 97 per cent of oxygen is transported by RBCs in the blood. The remaining 3 per cent of oxygen is carried in a dissolved state through the plasma. Nearly 20-25 per cent of carbon dioxide is transported by RBCs (carbaminohemoglobin), whereas 70 per cent of it is carried as bicarbonate (formed by dissociation of carbonic acid). About 7 per cent of CO2 is carried in a dissolved state through plasma.