A) Generally solids are better conductors than liquids
    B) Liquids are better conductors than Gases
    C) Metals are much better conductors than non-metals

In general, coefficient of heat conduction of solids is more than that of liquids, this factor dominates the effect of convection of heat in liquids.

Conduction and convection both take place in liquids and gases. But coefficient of heat conduction of liquid is more than that of gases. Also quantity of heat transmitted by convection depends upon the density of medium and density of liquid is more than that of gaseous substance.