Plasma contains around ______ of water.

The correct option is C

90%

The correct option is (C).

Explanation of the correct option:

1. Plasma is the light yellow-coloured fluid that makes up the major concentration (55%) of our blood.
2. It is made up of water, salts, proteins, etc.
3. The water concentration present in blood plasma is around 90%.

Final answer:

Plasma contains around 90% of water.