[单选题]
Which component of blo,asvcfeoe:nw*6 n/ 6(jr k x3ts (hu/n2 a1cuvod is mainly composed of water and transportsu1vplb-i8k+b k bqx6jqz4ow+6cl*: u water-soluble substances to differel*kpqub vqj z4o1b6+iu6 wc+kb8:xl- nt parts of the body?
A. Red blood cells
B. White blood cells
C. Platelets
D. Blood plasma