ANS:C - remove condensate and inert gases.

Steam traps are provided in steam carrying pipelines to remove condensate and inert gases. As steam flows through a pipeline, it undergoes condensation due to heat loss, forming condensate. Additionally, air and other inert gases may also accumulate within the steam system. Steam traps are designed to automatically remove condensate and non-condensable gases from the steam system, thereby ensuring efficient operation and preventing damage to equipment caused by water hammer or uneven heating. Therefore, the correct option is: remove condensate and inert gases.