The correct answer is B. decreases.
The viscosity of a liquid is a measure of its resistance to flow. It is usually measured in centipoise (cP). The viscosity of most liquids decreases with increasing temperature. This is because the molecules of a liquid move faster with increasing temperature, and they are therefore able to slide past each other more easily.
There are a few exceptions to this rule. For example, the viscosity of honey increases with increasing temperature. This is because honey is a very viscous liquid, and the molecules are not able to move past each other very easily even at high temperatures.
The viscosity of a liquid is an important property that affects many aspects of its behavior. For example, the viscosity of a liquid affects its flow rate, its ability to be pumped, and its resistance to evaporation.