Correct statement(s) among the following is/are

I) Strong intermolecular forces between molecules result in higher viscosity.

II) Viscosity of liquid decreases as temperature increases.

III) Glass is an extremely viscous liquid. 

 Strong intermolecular forces between molecules result in higher viscosity, this is due to the fact that large unions leads to the formation of complex structures.

 Viscosity of liquid decreases as temperature increases, due to the cleavage of bond the complex structure simplifies.

 Glass is an extremely viscous liquid, due the nature of forces operating.