[单选题]
Which component of blood is mainly comp4* (cjovp )hq; gnzzqgd+52 duosed of water a0 w6+ j 17znrlgx83v(ul mlszrnd transports water-soluble0 lsr6rzjl 7(mxwg+ vnu8zl3 1 substances to different parts of the body?
A. Red blood cells
B. White blood cells
C. Platelets
D. Blood plasma