The correct answer is: B. dynamic viscosity = kinematic viscosity x density.
Specific gravity is a dimensionless number that compares the density of a substance to the density of water. It is calculated by dividing the density of the substance by the density of water.
Dynamic viscosity is a measure of the resistance of a fluid to flow. It is calculated by dividing the shear stress by the rate of strain.
Kinematic viscosity is a measure of the fluidity of a fluid. It is calculated by dividing the dynamic viscosity by the density.
The relationship between dynamic viscosity and kinematic viscosity is given by the following equation:
$\mu = \rho \nu$
where $\mu$ is the dynamic viscosity, $\rho$ is the density, and $\nu$ is the kinematic viscosity.
Therefore, the correct answer is B.