Answer:
The correct option is C. Water is an excellent solvent.
Explanation:
Plasma can be described as blood which is made up of 92% water. The basic role that water plays in the plasma is of a solvent. It readily dissolves substances in it and transports them. Hence. option C is correct.
Option A cannot e considered because moderation of temperature won't fulfil the task of the blood i.e transportation.
Option B cannot be considered because expansion or compression of water are not such factors which help in blood transportation.