ANS:B - remove water resulting from partial condensation of steam.

A steam trap is primarily used to remove water resulting from the partial condensation of steam in a steam system. When steam flows through a pipeline, it can lose heat and partially condense, forming liquid water along with the steam. A steam trap is designed to automatically remove this condensate from the steam system, ensuring that only dry steam continues to flow. So, the correct statement is: "remove water resulting from partial condensation of steam."